Garmin GNC 250, Pilot'S Manual

Page 1: ...GNC 250 TM Pilot s Guide OWNER S MANUAL REFERENCE ACTV STBY GNC 250 NAV WPT RTE NRST SQ MSG CLR ENT CRSR 250 real 7 14 98 9 31 AM Page i ...

Page 2: ...250 real 7 14 98 9 31 AM Page ii ...

Page 3: ...51 8DU All rights reserved No part of this manual may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying and record ing for any purpose without the express written permission of GARMIN Information in this document is subject to change without notice GARMIN reserves the right to change or improve their products and to make changes in the content...

Page 4: ...very 28 days A database information packet is included in your GNC 250 package Pilots using an out of date database do so entirely at their own risk ii INTRODUCTION Cautions NOTE This device complies with Part 15 of the FCC limits for Class B digital devices This equipment gener ates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruc tions may ...

Page 5: ...llowing items If any parts are missing or damaged please see your GARMIN dealer immediately Standard Package GNC 250 unit NavData Card Installation Rack Connectors Pilot s Guide Quick Reference Guide Database Subscription Packet Warranty Registration Card Optional Accessories Remote Battery Pack AC Adapter PC 250 Interface Kit User Data Card 28 to 14 volt DC converter iii INTRODUCTION Accessories ...

Page 6: ...ace any components which fail in normal use Such repairs or replacement will be made at no charge to the customer for parts or labor The customer is how ever responsible for any transportation costs This warranty does not cover failures due to abuse misuse accident or unauthorized alteration or repairs GARMIN International Inc assumes no responsibility for special incidental punitive or consequent...

Page 7: ...mmunicating with the GNC 250 29 Using the GNC 250 s radio Section 3 Waypoint and Database Information W key 33 Finding and using database and waypoint information Section 4 Nearest Waypoints T key 53 Finding nearest waypoints SUAs and FSS frequencies Section 5 Direct to Route Navigation R key 58 Creating and using routes v INTRODUCTION Table of Contents To quickly and easily locate information on ...

Page 8: ... and Messages 86 Appendix E Specifications 94 Appendix F Map Datums 95 Appendix G Index 97 GARMIN is fully committed to your satisfaction as a customer If you have any questions regarding the GNC 250 please contact our customer service department at GARMIN International Inc 9875 Widmer Rd Lenexa KS 66215 1239 913 599 1515 FAX 913 599 2377 vi INTRODUCTION Table of Contents 250 real 7 14 98 9 31 AM ...

Page 9: ...et and closest point of approach are also performed using the route key See Section 5 for more information on routes W The waypoint key is used to view information such as runways frequen cies position and comments on airports VORs NDBs intersections and user waypoints See Section 3 for more information on the database N The navigation key is used to view navigation and position information Planni...

Page 10: ...mm window and enable the pilot to change frequencies Pressing C again will activate the cursor in the GPS window indicated by flashing characters in a GPS window field It is used to highlight fields for data entry changing information or cycling through available options O The outer knob is used to advance through pages advance the cursor or move through data fields K The inner knob is used to cha...

Page 11: ... any of the factory default settings position format units of measure selectable fields etc the pictures used may not match your configuration Prior to using your GNC 250 for the first time we recommend that you taxi to a location that is well away from buildings and other aircraft so the unit can collect satellite data without interruption Powering up the GNC 250 The GNC 250 s power and volume ar...

Page 12: ... be prompted to enter the altitude with a Need alt Press NAV message If this message occurs press the N key and use the K and O knobs to enter the altitude shown on your altimeter Press E when finished If the GNC 250 has not been operated for a period of six months or has moved over 300 miles without actively tracking satellites it may have to Search the Sky to collect new data This means the unit...

Page 13: ...res To select the active frequency you must first enter the frequency in the standby field and use the key to move it to the active field To change the standby communication frequency 1 Press C once to activate the cursor in the comm window 2 Rotate the outer knob O to select the MHz and the inner knob K to select the kHz of the desired frequency To place the standby frequency in the active field ...

Page 14: ...tings are Altitude Your present GPS altitude Present Position Latitude and longitude displayed in degrees minutes Reference Waypoint The bearing and distance to the nearest airport The position page is one of six pages available under the GNC 250 s NAV key CDI page NAVCOM page Position page Satellite status page NAV menu 1 NAV menu 2 During most flights the position CDI course deviation indicator ...

Page 15: ...DB intersection or user waypoint as long as it is in the database or stored in memory as a user waypoint 3 Rotate the O knob to the right to move the cursor to the next character position 4 Repeat steps 2 and 3 to spell out the rest of the waypoint identifier 5 Press E to confirm the identifier The direct to confirmation page will appear 6 Press E to confirm the destination Once the direct to dest...

Page 16: ...ath If you do not have an active departure airport the navigation communications page will display the frequencies for the airport nearest your present position To view the NAVCOM page from the CDI page rotate O one stop to the right The NAVCOM page lists your departure and arrival airports on the left side of the page with all the database frequencies listed in a column down the right side of the...

Page 17: ...sent position The nearest feature can also be used to quickly find the contact frequency of the near est airport and enter it in the standby field To view the nine nearest airports 1 Press the T key The nearest airport will be displayed with the range and bearing from your present position along with elevation frequency and runway data 2 To review the rest of the nearest airport list rotate the K ...

Page 18: ...ge for the selected waypoint will appear 2 Press E to confirm Congratulations You ve now gone through the basic operation of the GNC 250 We encourage you to experiment with your new GPSCOM to get to know all the advanced navigation features it has to offer If you d like a little more practice try using the built in simulator described in Appendix C An optional AC adapter will even let you plan and...

Page 19: ... instructions will appear and the indicator will flash If you leave the NAV page sequence for another set of pages the last NAV page dis played will appear when you return to the nav sequence 9 REFERENCE NAV key overview Remember The NAV pages will only display information AFTER the position and navigational information has been calculated from the satellites If you are on the Position page before...

Page 20: ... down arrow The default setting of the CDI scale is 5 0 nm If you are not navigating to a destination the CDI field will display a no actv wpt message and only speed and track data will be available The CDI field is also used to display the GNC 250 s turn anticipation and waypoint alert data during route operations see section 5 In addition to displaying your active destination and the course devi...

Page 21: ...aring the direction from your present position to the waypoint cts Course to steer to reduce cross track error and re intercept course dtk Desired track the course between the active from and to waypoints trn Turn the direction and degrees to turn to get back on course The following information can be displayed in the time field eta Estimated Time of Arrival at the active to waypoint ete Estimated...

Page 22: ...ection of the arrow prompts at the bot tom left of the page The frequencies displayed for the departure and arrival airports are listed in the order you are most likely to use them see left with the available frequencies dis played to the right of the airport identifier If you do not have an active route with a departure airport the NAVCOM page will display the frequencies for the airport nearest ...

Page 23: ... N Some frequencies in the NAVCOM page have tags which designate their usage tx transmit only rx receive only pt part time frequency To make any of the frequencies on the NAVCOM page the standby frequency 1 Press C twice to activate the cursor in the GPS window 2 Rotate O until the desired frequency is highlighted 3 Press E to make the highlighted frequency the standby frequency The cursor will au...

Page 24: ...ontained in the database and gen erally include mountains buildings and other permanent features see left To change the altitude field 1 Press C twice to obtain a flashing cursor in the GPS window 2 Rotate O until the alt ESA MSA field is highlighted 3 Rotate K to display the desired data Press C to return to normal navigation 14 REFERENCE CDI Page Position page displaying MSA The same position pa...

Page 25: ...range and bearing to be displayed 4 Press C to remove the cursor or If you have selected wpt 5 Rotate O to advance the cursor to highlight the identifier field 6 Use the K and O knobs to enter the identifier name This waypoint identifier can be an airport VOR NDB intersection or user waypoint Press E 7 Press C to confirm the selection This allows any waypoint s distance and bearing to be listed co...

Page 26: ...ctions may be displayed in the DOP EPE field dop Dilution of Precision a measure of the satellite geometry quality and relative accuracy of your position with 1 meaning good geometry and 10 meaning poor epe Estimated Position Error an overall measure of your positional accuracy in feet or meters using signal and data quality receiver tracking status and DOP 16 REFERENCE NAV Menu 1 Trip Planning St...

Page 27: ...clude an altitude serializer you must enter the altitude manually see page 2 3D Nav The GNC 250 is in 3D navigation mode and will compute altitude Simulator The GNC 250 is in simulator mode which should only be used for practice and trip planning Never use simulator mode for actual navigation Poor cvrg The GNC 250 cannot acquire sufficient satellites for naviga tion Need alt The GNC 250 needs alti...

Page 28: ...O to highlight the satellite number you wish to view and press E This will display the satellite data page showing the selected satellite s number elevation angle rise or fall indication User Range Accuracy URA or the range measurement accuracy as determined by the satellite azimuth and signal strength To view other satellites 4 Rotate K to view information for the next satellite 5 Rotate O and pr...

Page 29: ...cu late several possible ETEs To use the trip planning function 1 Press N and rotate O until NAV Menu 1 is displayed 2 Press C twice then E to access trip planning 3 Rotate K to select waypoint mode or desired route number and press E 4 For direct to navigation use K and O to enter the to and from waypoints Press E to accept the waypoints To use your present position as a waypoint leave the way po...

Page 30: ...es and press E 7 Use K and O to enter the total air temperature 8 Press E and the density altitude and true airspeed will be calculated and displayed 9 Press C to remove the cursor If your installation includes components to provide any of the information required on the density altitude page they will be used as the defaults The fuel planning page will display fuel requirements for both direct to...

Page 31: ...1 leg 2 Fuel required to complete leg 4 is leg 1 leg 2 leg 3 leg 4 6 Rotate O to advance the cursor to fob or gs depending on which is displayed 7 Use K and O to enter the fuel on board or the ground speed Press E 8 Rotate O back two positions to highlight the fob or gs field again 9 Rotate K to display the other information Press E 10 Use K and O to enter the remaining data Press E 11 Use K and O...

Page 32: ... speed requirements to reach a desired altitude before or after a specified distance from a waypoint This is helpful when you d like to descend to a cer tain altitude near an airport or climb to an altitude before reaching a route or direct to waypoint To calculate vertical navigation parameters 1 Press N and rotate O until NAV Menu 1 is displayed 2 Press C twice and rotate O until Vnav Plan is hi...

Page 33: ...mind you of repetitive tasks that can be called up at any time for review The checklist feature is useful for creating pre flight checklists landing checklists emergency proce dures etc Each name or function can have up to 16 characters each To create a checklist 1 Press N and rotate O until NAV Menu 1 is displayed 2 Press C twice and rotate O until Chklist is highlighted Press E 3 Press C and use...

Page 34: ...uding Approach timer Clock Date and time Trip Timer RAIM Prediction Scheduler Sunrise and sunset calculations The approach timer acts as either a count up or a count down timer that can be set or reset at any time To activate change view the approach timer 1 Press N and rotate O until NAV Menu 2 is displayed 2 Press C twice and rotate O until Appr Time is highlighted Press E 3 Rotate K to select e...

Page 35: ... Use K to select either UTC or local time to be displayed in the time fields Press E 4 Use K and O to set the local date Press E 5 Use K and O to set the local time Press E 6 Press C to complete The GNC 250 s trip timer will automatically keep track of the duration of your current trip and can be configured to run when the GNC 250 is on or when your ground speed exceeds a specified value see secti...

Page 36: ...o change 4 Use K and O to enter the waypoint name or leave it blank to use your current position Press E to accept 5 Use K and O to enter the ETA in hours and minutes in local or UTC time whichever you have selected from the clock display and the day month and year The current date will be displayed automatically Press E to accept 6 Rotate O to highlight Compute RAIM 7 Press E to compute informati...

Page 37: ...o highlight the message you would like to edit To delete press then E 5 Use K and O to enter the message Press E 6 Use K and O to set the elapsed time until the message is displayed in hours and minutes up to 99 hours and 59 minutes this time is cumulative and counts whenever the GNC 250 is on in normal operating mode 7 Press E You may edit another scheduled message by repeating steps 3 4 and 5 or...

Page 38: ...se and sunset times at a waypoint or at your present location 1 Press N and rotate O until NAV Menu 2 is displayed 2 Press C twice and rotate O to highlight Sunrise Press E 3 Use K and O to enter the waypoint identifier or leave blank to use current position Press E 4 Press E to accept the waypoint information 5 Use K and O to enter the date desired 6 Press E and the sunrise and sunset times will ...

Page 39: ...t by accessed directly Whenever the cursor is active in the comm window the standby frequency will by highlighted e g 121 50 To access the standby frequency press C This allows you to change the megahertz number to the left of the decimal by rotating O and the kilohertz number to the right of the decimal by rotating K If you would like to keep the standby field hot ready for an immediate frequency...

Page 40: ...ecome splatted or blocked out Once the standby frequency has been entered you may return to data entry by pressing the CRSR key The flashing cursor will return you to the active GPS field at the point where you stopped data entry The GNC 250 s auto tune feature allows you to quickly select any database fre quency in the GPS window as your standby frequency To auto tune a single frequency displayed...

Page 41: ...owered up the automatic squelch will be in the on position allowing only transmissions which are powerful enough for clear broadcast to be received Manual squelch control is not available To override the automatic squelch control 1 Press the Q key Press Q again to return to automatic squelch Whenever the GNC 250 is transmitting a tx icon will appear between the active and standby frequency fields ...

Page 42: ...cy The emergency channel select is available whenever the unit is on regard less of GPS or cursor status or loss of the display To automatically tune for emergency transmission 1 Press and hold the key for more than two seconds 32 The emergency channel will appear in the active field SECTION 2 COMM FEATURES Emergency Channel Selection 250 real 7 14 98 9 32 AM Page 32 ...

Page 43: ...and rotating the outer knob until the desired page is displayed or by pressing the WPT key repeatedly 33 REFERENCE Airport Communication Please note that your GNC 250 uses ICAO identifiers for all airports All U S airport identifiers which contain only letters use the prefix K For example Los Angeles International is KLAX under the ICAO standard Other airports such as Otten Memorial 3VS that conta...

Page 44: ... position lat lon frequency and weather broadcast indication Intersections Identifier country position lat lon nearest VOR User Identifier name position lat lon reference waypoint To view the waypoint information for a desired waypoint select the waypoint category from the waypoint menu page To choose a waypoint category for viewing information 1 Press W and rotate O to display the waypoint menu p...

Page 45: ... and rotate O to display the waypoint menu page 2 Press C twice and rotate O to highlight the desired waypoint category 3 Press E to accept the waypoint category 4 Rotate O to highlight the middle field to enter location city OR Rotate O to highlight the bottom field to enter facility name or VOR NDB name 5 Use K and O to enter the location or the name and press C to finish As the information is e...

Page 46: ...point menu page airports VORs NDBs intersections and user waypoints Airport Information To scroll through the airport pages 1 Make sure the cursor is not flashing If it is press C 2 Rotate O in either direction to scroll through the available pages 36 REFERENCE VOR Position Page Airport Comments Page Airport Runway Page Airport Position Page Airport Identification Page Airport Communication Page S...

Page 47: ...gnations length surface and lighting information displays ILS localizer and or pilot controlled lighting frequencies airport comments allows entry of desired airport by identifier displays user comments for the selected airport The airport identification page displays a selected airport s identifier region and country city state and facility name The identification page is always the first airport...

Page 48: ... fuel is available av jet Both av gas and jet fuel are available Position In degrees minutes or degrees minutes seconds of latitude and longitude Approach Information displays the airport approaches available no apr No approach is available np apr Non precision approach is available loc Localizer approach is available ils ILS approach is available Controlled Airspace Information displays controlle...

Page 49: ...ormation service ATIS ptx Pre taxi clr Clearance delivery gnd Ground twr Tower uni Unicom mul Multicom atf Aerodrome traffic frequency ctf Common traffic advisory frequency CTAF mf Mandatory frequency oth Other frequencies Frequencies with restriction information dep Departure apr Approach arv Arrival class B cta ICAO control area tma ICAO terminal control area class C trsa Terminal radar service ...

Page 50: ...If a localizer and ILS are used on the same runway rotating K will display both sets of information The following descriptions and abbreviations are used on the airport runway page Runway surfaces hard Hard concrete asphalt etc turf Turf grass seal Sealed surface grav Gravel surface dirt Dirt surface soft Unknown soft surface unkn Unknown surface watr Water landing site Runway lighting pt lights P...

Page 51: ...entifier city or facility name see page 35 on any VOR waypoint page The VOR identification and comments pages are identical in form and function to their airport page counterparts To scroll through the VOR pages 1 Make sure the cursor is not flashing If it is press C 2 Rotate O in either direction to scroll through the available pages In addition to displaying the VOR frequency magnetic variation ...

Page 52: ...e cursor is not flashing If it is press C 2 Rotate O in either direction to scroll through the available pages The NDB position page see above displays the selected facility s identifier fre quency and position as well as any weather broadcasts available The NDB comment page will display any user comments for the selected NDB see page 50 for instruc tions on entering user comments 42 REFERENCE Pro...

Page 53: ...otate O to toggle between the available pages The intersection position page displays the selected facility s identifier region and or country latitude and longitude and the identifier distance and bearing to the nearest VOR not necessarily the VOR used to define the intersection The intersection com ment page will display any user comments for the selected intersection see page 50 43 REFERENCE Us...

Page 54: ...e created or modified using the W key After select ing the waypoint identifier as shown on page 35 you will be prompted to enter infor mation if the waypoint is new There are three ways to create a user waypoint s posi tion from the W key 1 Enter the exact position of the new waypoint 2 Reference a known waypoint 3 Enter a range and bearing from your current position To create or edit a user waypo...

Page 55: ...he latitude You may select either north or south and enter a latitude up to but not including 90 2 Press E 3 Use K and O to enter the longitude You may select either east or west and enter a longitude up to but not including 180 4 Press E Once the latitude and longitude have been entered the flashing cursor will move to the reference waypoint field where you may enter a reference waypoint to calcu...

Page 56: ...you will enter the bearing and distance at which you would like the new waypoint to be located To create a user waypoint offset from your present position 1 Use K and O to enter the bearing from your position 2 Press E 3 Use K and O to enter the distance from your position 4 Press E The latitude and longitude will be calculated for the new waypoint 5 Press E to confirm the ok prompt and save the w...

Page 57: ...will help you differentiate AutoStore waypoints from other user waypoints To change the name or the route of an AutoStore waypoint 1 Rotate O to select the name or route number field 2 Use K and O to enter the name or route number If you do not want to add the way point to a route be sure to keep the route field blank 3 Press E to accept 4 Press E to confirm the ok prompt If the waypoint name is a...

Page 58: ...nd their regions overlap you will be informed with the message Proximity overlap This message will be displayed each time you turn on the GNC 250 for as long as the overlap remains Warning If you enter the overlap area you will only be informed of the nearest proximity waypoint To remove a waypoint from the proximity waypoints page 1 Press C twice if necessary to obtain a cursor in the GPS window ...

Page 59: ...ypoint part of an active or stored route or a proximity waypoint To edit rename or delete waypoints the cursor must highlight the desired waypoint To highlight a waypoint 1 Press C twice and use O to highlight the desired waypoint To edit a highlighted waypoint 1 Press Eto obtain the waypoint position page Edit the waypoint position as described on pages 45 46 Note The active to waypoint cannot be...

Page 60: ...comment 5 Press E to accept and repeat steps 4 and 5 if necessary to enter information on another line 6 Press C to remove the cursor To view the waypoints with comments list 1 Press W and use O to display the Wpts with comments page 2 Use K to scroll through the list The GNC 250 will display the waypoints with comments in alphabetical order up to six waypoints at a time The scrolling arrow prompt...

Page 61: ... to choose the desired waypoint The waypoint identifier and number of duplicates will be shown at the top of the page with the waypoint type and region of each duplicate indicated below The way points listed are sorted by the distance from your present position To scroll through additional duplicate waypoints 1 Rotate O with the flashing cursor active or K with the flashing cursor inactive To sele...

Page 62: ...o scan through airports VORs NDBs and intersections in the database by identifier facility name or city Waypoint scanning may be used from any blank identifier field in the GPS window To enter a waypoint by scanning the identifier facility name or city 1 With the cursor over a blank identifier field press W If the identifier field is not blank highlight the field with the flashing cursor and press...

Page 63: ... nearest airport page You may also place the displayed frequency into the standby field by pressing E from the nearest airport page To view more comm runway information 1 Press C twice and rotate O to highlight the comm field or the runway field 2 Rotate K to scroll through more information if available To perform a direct to from any of the nearest waypoint pages 1 Press D The waypoint confirmati...

Page 64: ...earby airspace Once you have met one of the described conditions the message annunciator will flash alert ing you of an SUA message To view an SUA message 1 Press the M key 2 Press M again to return to the previous page Once you are notified of a SUA alert detailed information concerning the specific SUA is provided by the NRST key To view the SUA alert page 1 Press the T key 2 Rotate O one stop t...

Page 65: ...are projected to enter the airspace The second line of the SUA alert page displays the name or controlling agency of the SUA along with the SUA type to which you are being alerted To toggle between the SUA name and controlling agency display 1 Rotate K one stop in either direction If the SUA name or controlling agency is too long to fit on the display the GNC 250 will automatically scroll to displ...

Page 66: ...floor altitudes for the SUA alert Controlling agency frequencies may be viewed by highlighting the controlling airport identifier with the cursor and pressing E The following are examples of what can appear in the altitude fields Message Meaning 8000ftM 8000 feet mean sea level MSL 3000ftA 3000 feet above ground level AGL ground Ground level msl Mean sea level notam See Notice to Airmen NOTAM for ...

Page 67: ...essages Any applicable SUA alert pages will still be available from the NRST key The GNC 250 also features an altitude buffer which may be set to provide a greater level of protection from penetrating an SUA By specifying an altitude in the buffer you can effectively stretch an SUA s altitude boundaries in both directions This allows the pilot to add an extra margin of prevention around controlled...

Page 68: ...omatic leg sequencing and turn anticipation features will automatically select the next waypoint as the active to waypoint and provide smooth steering guidance around the turn If you are not currently navigating a particular route leg e g your starting position is not a route waypoint the GPS will select the appropriate leg as the active route segment 58 APPENDIX A Current Messages ROUTE TERMINOLO...

Page 69: ...ed by E twice A direct to may also be quickly activated from many pages that display a single waypoint identifier e g the nearest airport page by simply pressing D and E For pages that display a list of waypoints e g the user waypoint list page you must highlight the desired waypoint with the flashing cursor before pressing the D key Once a direct to is activated the GNC 250 will provide navigatio...

Page 70: ...dge the ok prompt The GNC 250 will now use the selected course for your CDI and DTK steering guidance To reset the course to a GPS calculated course from your present position simply press D followed by E 60 APPENDIX A CDI Scale Settings The waypoint sequencing field located at the bot tom left of the direct to confirmation page allows you to hold on a selected route waypoint and prevent the GNC 2...

Page 71: ...fore it is cancelled overwritten or erased The GNC 250 s route catalog page is used to create edit delete or copy routes and serves as the main page for a host of functions These include route activation determining the closest point of approach and search and rescue operations It also displays a summary of routes currently stored in memory with the departure and arrival route waypoints and total ...

Page 72: ...r during your flight To create or edit a route from the route catalog page 1 Use K to display the route number you would like to edit 2 Press C twice 3 Use K to select edit Press E The route review page will appear To add a waypoint 4 Rotate O to highlight the first blank waypoint field or the point where you want to enter the new waypoint The first waypoint field will already be flashing if you r...

Page 73: ...ed route into route 0 and overwrites the existing active route To activate a route 1 Press R and use O to display the route catalog page 2 Rotate K to display the route you would like to activate 3 Press C twice and use K to display activate Press E After travelling a route or creating a route with the GNC 250 s AutoStore feature the route activation field may be used to activate the route in reve...

Page 74: ...to display the route you would like to use for the CPA function The route must con sist of at least two waypoints and the reference facility must fall between the waypoints of a route leg 2 Press C twice and rotate K to select cpa Press E 3 Use K and O to enter the identifier of the reference waypoint 4 Press E The bearing and distance of the closest point on the route will be displayed 5 Press E ...

Page 75: ... or L Press E 6 Rotate O to highlight the initial offset and use K and O to enter the initial offset value and R or L 7 Press E three times to accept the operation values and begin navigation After activating a search and rescue you will be informed with an Offset nav in effect message each time you traverse the route offset from the anchor waypoints Once you ve arrived at the destination waypoint...

Page 76: ...he leg 5 Press E to accept It is important to note that offset navigation is only available on route navigation not direct to navigation When offset navigation is activated an Offset nav in effect message will be displayed with the distance and direction noted on the route catalog page for route 0 If you enter an offset which causes a leg to be reversed you ll be informed with the message Ofst too...

Page 77: ...rotating O left continuously It will also appear whenever a route is activated To scroll through the active route waypoints 1 Rotate K with the flashing cursor inactive or O with the cursor active The active leg identifiers field located at the top left of the page displays the way point identifiers of the route leg you are currently navigating The first waypoint iden tifier displayed is the activ...

Page 78: ...destination waypoint without modifying the active route If you are editing the active route and want to save it in its original form copy it to an open storage route before editing To add waypoints to the active route 1 Press C twice if necessary to activate the cursor 2 Use O to highlight the first blank waypoint field or highlight the waypoint before which you would like to add the new waypoint ...

Page 79: ...he selected waypoint and resume navigating the remainder of the route in sequence once you arrive at the next destina tion waypoint The waypoint sequencing field located at the bottom left of the direct to confirmation page allows you to select manual or automatic waypoint sequencing of route waypoints Setting the selector to the hold setting holds your current active to waypoint as your navigatio...

Page 80: ...the curved transition segment and the to from indicator on the CDI will flip momentarily During the transition the CDI display will be referenced to the dotted line illustrated at the left of this page As you approach a route waypoint the graphical CDI will be replaced by a flashing Next dtk xxxº prompt indicating the desired track of the next route leg Turn anticipation will not be provided if yo...

Page 81: ...o view the settings submenu press and hold M for more than 2 seconds Once the settings submenu has been accessed the following setup pages are available by rotating O with the flashing cursor inactive CDI scale settings Mag var arrival alarm settings Nearest airport search Battery saver Display intensity settings Trip timer settings Navigation units SUA settings Map datums I O Settings channel 2 o...

Page 82: ...rity Monitoring RAIM to cross check its position The RAIM protection limits listed below follow the selected CDI scale changing automatically with the Auto setting CDI Scale RAIM Protection 5 0 nm or Auto en route 2 0 nm 1 0 nm or Auto terminal 1 0 nm 0 3 nm 0 3 nm The GNC 250 has three magnetic variation options true auto or user defined To set the magnetic variation 1 Press and hold M and use O ...

Page 83: ...ttings allow you to define the runway length and surface type used in determining the nine nearest airports displayed A minimum runway distance and surface may be entered to prevent airports with small runways or runways that are not of appropriate surface from being displayed The default settings are 0 ft mt for runway length and any for runway surface To set the minimum runway length and runway ...

Page 84: ...to finish The GNC 250 features automatic brightness control to adjust the display for opti mum viewing in any condition This is done using a photocell at the top left corner of the display bezel It is important that this photocell not be covered to ensure prop er display adjustment You may also select manual control of the display brightness to tailor the GNC 250 to your needs To change the displa...

Page 85: ... K and O 7 Press E to accept and press C to complete The GNC 250 can be configured to display data in standard or metric units of mea sure These apply to distance position speed altitude fuel pressure and temperature To change the units of measure 1 Press and hold M and rotate O to display the nav units page 2 Press C twice and rotate O to highlight the field you would like to change 3 Use K to ch...

Page 86: ...v units nautical miles and knots nm kt statute miles and miles per hour mi and mh kilometers and kilometers per hour km and kh fuel gallons gl imperial gallons ig kilograms kg pounds lb liters lt pressure inches of mercury hg millibars mb temperature degrees Fahrenheit f degrees Celsius c 76 APPENDIX D Messages Abbreviations Units of Measure Settings metric SECTION 6 UNIT SETTINGS Units of Measure...

Page 87: ... are within a certain range of an SUA For example if the buffer is set at 500 feet and you are 500 feet above or below an SUA you will not be notified with an alert message if you are less than 500 feet above or below an SUA and projected to enter it you will be notified with an alert message The default set ting for the altitude buffer is 200 feet To set the warnings or change the altitude buffer...

Page 88: ...atum to one listed in Appendix F 1 Press and hold M and use O to highlight the map datum page 2 Press C twice 3 Use O to highlight the current map datum 4 Use K to change the datum 5 Press C to complete To create a user datum 1 Press and hold M and use O to highlight the map datum page 2 Press C twice 3 Use O to highlight Define user datum Press E 4 Enter the five parameters of the map datum using...

Page 89: ... GNC 250 installation manual The input option for channel 2 is intended for future interfacing capabilities and is not a selectable option at this time To change the output settings for I O channel 2 1 Press and hold M and rotate O until the I O setup page is displayed 2 Press C twice and rotate K to select off or plotting for output to a RS 232 device 3 Rotate O to advance the cursor to the baud ...

Page 90: ...80 250 real 7 14 98 9 33 AM Page 80 ...

Page 91: ...y reinitialize You may also reinitialize the unit manually by pressing ENT An optional user data card can be used to make a backup of user waypoints routes etc and transfer information to another GNC 250 To save user data to the user data card 1 Install the user data card 2 Rotate O to highlight Save user data Press E to confirm The message Saving to card is displayed while the GNC 250 transfers a...

Page 92: ...data from the card Updating the data will not delete unrelated material but will only change what is necessary to use the data received from the user data card 5 Rotate O to select either Replace or Update 6 Press E to begin transferring data to the GNC 250 The GNC 250 will now transfer all of the data requested This may take a few minutes 7 To continue with more data transfer types repeat steps 4...

Page 93: ... the rack 83 The GNC 250 is built to exacting standards and does not require user maintenance If the faceplate and lens require cleaning use a soft cloth and non abrasive cleaner The user data is maintained by an internal battery with a projected life of 3 to 5 years If the GNC 250 detects a low memory battery you will be informed with the message Memory battery low Failure to have the battery rep...

Page 94: ...shing cursor over the operating mode field Normal 3 Rotate K to select Simulator and press the E key The cursor will advance to the ok prompt 4 Press E to confirm Once the GNC 250 has been placed in simulator mode the database confirmation page will appear showing the operating dates cycle number and database type available To acknowledge the database information 1 Press E After the database has b...

Page 95: ...n from the direct to confirmation page Altitude may only be entered by using the VNAV function available from the NAV menu 1 page see page 22 To enter a ground speed from the CDI page 1 Press N and rotate O to display the CDI page 2 Press C twice to activate the cursor in the GPS window 3 Rotate O to highlight the ground speed field 4 Use K and O to enter the desired speed Press E to accept and C ...

Page 96: ... active from waypoint The GNC 250 will not allow the modifications Cannot nav lockd rte An attempt has been made to activate a route containing a locked waypoint The GNC 250 cannot perform navigation in this situation Cannot ofst goto rte An attempt has been made to engage the offset navigation feature while the GNC 250 is navi gating using a single waypoint route The GNC 250 will not allow offset...

Page 97: ...ust not be used for actual navigation EEPROM write fail The GNC 250 has detected a failure while programming its installation configuration memory The unit is not usable and should be taken to an authorized service center Final altitude alert The suggested altitude is within 1000 feet of the final altitude entered on the VNAV Planning page Fuel Air input fail The fuel and or air data input is not ...

Page 98: ...etected excessive drift in its internal crystal oscillator which may result in longer acquisition time The unit should be taken to an authorized service center immediately Poor GPS coverage The GNC 250 cannot acquire sufficient satel lites necessary to provide navigation Prox alarm press NAV Your craft has penetrated the alarm circle of a proximity waypoint Press NAV to see the bearing and distanc...

Page 99: ...r position Receiver failed The GNC 250 has detected a failure in the receiver hardware If the message persists the GNC 250 is unusable and should be taken to an authorized GARMIN service center Remote ENT key stuck The remote ENT key is stuck in the pressed state Check the installation Remote XFR key stuck The remote XFR key is stuck in the pressed state Check the installation ROM failed The GNC 2...

Page 100: ...ext 10 minutes SUA near ahead Your position is within two nautical miles of an SUA and your current course will take you inside Timer expired The approach timer has expired User data RX started Data receive operations have started Usr data TX complete Data transmit operations are complete VNAV cancelled The VNAV function has been cancelled due to a change in the active route WGS 84 datum selectd T...

Page 101: ...mon Traffic Advisory Frequency CTS Course To Steer CUM Cumulative DALT Density Altitude DEG Degrees DEP Departure DIS Distance To Waypoint DME Distance Measuring Equipment DOP Dilution of Precision DTK Desired Track ELEV Elevation ENDUR Endurance EPE Estimated Position Error ESA Enroute Safe Altitude ETA Estimated Time of Arrival ETE Estimated Time Enroute FLOW Fuel Flow Rate FOB Fuel On Board FPM...

Page 102: ...N Minimum MIN Minutes MOA Military Operations Area MPM Meters Per Minute MPS Meters Per Second MSA Minimum Safe Altitude MT Meters MUL Multicom NDB NDB Waypoint NM Nautical Miles NP Non Precision NR Nearest OBS Omni directional Bearing Select Inbound Course Select OTH Other ºC Degrees Celsius ºF Degrees Fahrenheit PC Pilot Controlled POSN Position PRES Barometric Pressure Altimeter Setting PROX Pr...

Page 103: ...MP Temperature TMA ICAO Terminal Control Area TRK Track Angle TRN Turn Angle TRSA Terminal Radar Service Area TWR Tower TX Transmit Only U UTC Time UNI Unicom URA User Range Accuracy USER User Waypoint USR User Waypoint UTC Universal Time Coordinated GMT Zulu VN VNAV or Vertical Navigation VNAV Vertical Navigation VOR VOR Waypoint WPT Waypoint WX Weather XFR Transfer SECTION D MESSAGES ABBREVIATIO...

Page 104: ...5 watt minimum transmit power Receiver MultiTrac 8 Acquisition Time 2 2 5 minutes typical 15 seconds warm start with ephemeris Update Rate 1 per second continuously Accuracy 15 meters 49ft RMS Dynamics 999 knots velocity 3g acceleration INTERFACES ARINC 429 Plotting NMEA 0183 V2 0 Aviation PC Interface Altitude Serializer Fuel Sensor Fuel Air Data Computer Subject to accuracy degradation to 100m 2...

Page 105: ...REGO ALEGRE Brazil DANISH GI 1934 Denmark DJAKARTA BATAVIA Sumatra Island Indonesia DOS 1968 Gizo Island New Georgia Islands EASTER ISLAND 1967 Easter Island EUROPEAN 1950 Austria Belgium Denmark Finland France Germany Gibraltar Greece Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland EUROPEAN 1979 Austria Finland Netherlands Norway Spain Sweden Switzerland FINLAND HAYFORD 1910...

Page 106: ...IIAN MAUI Maui OLD HAWAIIAN MEAN Mean Value OLD HAWAIIAN OAHU Oahu OMAN Oman ORD SRV GRT BRITAIN England Isle of Man Scotland Shetland Islands Wales PICO DE LAS NIEVES Canary Islands PITCAIRN ASTRO 1967 Pitcairn Island PORTUGUESE 1973 Portugal POTSDAM Germany PROV SO AMERICAN 56 Bolivia Chile Colombia Ecuador Guyana Peru Venezuela PROV SO CHILEAN 1963 South Chile PUERTO RICO Puerto Rico Virgin Isl...

Page 107: ...Battery Pack 94 Battery saver 74 C Cautions ii CDI 4 6 70 CDI page 4 6 9 12 70 CDI sensitivity setting 72 Channel 2 I O 79 Checking GPS coverage 16 17 26 Checklists 23 24 Clear key viii Clock function 25 Closest point of approach CPA 64 Communication features 29 32 Communications pages 29 30 37 39 Communication frequencies 3 29 Communication window 3 Controlled airspace 38 54 57 Copying routes 64 ...

Page 108: ... viii L Leg time field 68 Locked waypoints 52 M Magnetic variation 72 73 Maintenance of the GNC 250 83 Map datums 78 95 96 Measurement units 76 Messages 71 86 90 MSG key viii N NAVCOM page 6 12 13 NavData cards 33 81 82 Navigation diagram 11 NAV Key vii 9 NAV menu 1 9 19 23 NAV menu 2 9 24 27 Nav units 76 NDBs 34 42 NRST key vii 7 53 Nearest airport 8 76 Nearest SUA 54 57 77 Nearest waypoints 8 53...

Page 109: ...ata 81 SUA alert page 54 SUA altitude fields 55 SUA messages 56 SUA settings page 57 77 Sunrise sunset planning 28 Squelch vii 30 T Table of contents v vi Time 25 Transfer key viii Trip planning 19 Trip timer 25 75 Trip timer settings 75 True air speed 20 Turn anticipation 70 U Unit settings 71 79 Updating user data 80 User comments 81 User data cards 80 User map datums 79 User waypoints 33 44 49 ...

Page 110: ...100 APPENDIX G Index Waypoint scanning 52 Waypoint sequencing 69 70 Waypoints with comments 50 Winds aloft 22 SECTION G INDEX 250 real 7 14 98 9 33 AM Page 100 ...

Page 111: ...250 real 7 14 98 9 33 AM Page 101 ...

Page 112: ... 1995 GARMIN International 9875 Widmer Lenexa KS 66215 USA GARMIN Europe LTD Robert House Station Approach Romsey Hampshire SO51 8DU UK Part No 190 00067 50 Rev A 250 real 7 14 98 9 33 AM Page 102 ...