Reference
40
Main Menu: GPS Tab
• Track— Lets you record a track and defi ne how it is recorded and displayed.
• Time— Displays current time, and sets up time format, time zones, and daylight savings.
• Map— Sets up Map Page features, display, zooms, and text size. See pages 9-13.
• Systm— Defi nes simulator, WAAS, backlight timeout, beeper, speed fi lter, language, displays power
source, restores setup, and displays software version.
• Loctn— Displays location format, map datum, heading and magnetic variation.
• Units— Defi nes units of measure for elevation, depth, distance and speed, temperature and direction
display.
• Comm— Defi nes interface settings for transferring data.
• Alarm— Sets up alarms for anchor drag, arrival, off course, clock, shallow and deep water, DGPS and
accuracy.
GPS Tab—
provides a visual reference of satellite acquisition, receiver status, and accuracy. The
status information show what the receiver is doing at any given moment. The sky view and signal
strength bars give an indication of what satellites are visible to the receiver and whether or not they are
being tracked. The signal strength is shown on a bar graph for each satellite, with the satellite number
below. As the receiver locks onto satellites, a signal strength bar will appear for each satellite in view,
with the appropriate satellite number underneath each bar.
The progress of satellite acquisition is shown in three stages:
• No signal strength bars— the receiver is looking for the satellites indicated.
• Light signal strength bars— the receiver has found the satellite(s) and is collecting data.
• Dark signal strength bars— the receiver has collected the necessary data and the satellite(s) are ready
for use.
As soon as the GPSMAP 176 has collected the necessary data from the best satellites in view to
calculate a fi x, the status fi eld will indicate a 2D or 3D status. The unit will then update the position,
date and time.
Sky
View
Signal Strength Bars
Accuracy
Receiver Status
Differential Status
DOP
45°
90°
Outer ring -
the horizon
Inner ring- 45°
above the horizon
Center dot - 90°
above the horizon
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