Humminbird ] 981 Installation & Operation Manual Download

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GPS AND CARTOGRAPHY

(With 987c SI Combo models only)

Your 987c SI Combo model uses GPS and sonar to determine your position, display it
on a grid, and provide detailed underwater information. The Global Positioning
System (GPS) is a satellite navigation system designed and maintained by the U.S.
Department of Defense. GPS was originally intended for military use; however,
civilians may also take advantage of its highly accurate position capabilities, typically
/- 10 meters, depending on conditions. This means that 95% of the time, the
GPS receiver will read a location within 10 meters of your actual position. The GPS
Receiver also uses information from WAAS (the Wide Area Augmentation System),
EGNOS (the European Geostationary Navigation Overlay Service), and MSAS (the
MTSAT Satellite Augmentation System) satellites if they are available in your area.

GPS uses a constellation of satellites that continually send radio signals to the earth.
Your present position is determined by receiving signals from up to 12 satellites and
measuring the distance from the satellites. The GPS Receiver allows you to combine
easy-to-use FishingGPS™ chartplotter and navigation capabilities with advanced
fishfinding. The following GPS functionality is currently supported by the 987c SI
Combo model when it is connected to a GPS Receiver:

• View current position

• View current track (breadcrumb trail)

• View precision speed and heading from your GPS receiver

• Save tracks, waypoints and routes

• Travel a route and navigate from one waypoint to the next.

NOTE:

Only the 987c SI Combo models support Navionics® Gold Charts marine cartography

and Navionics® HotMaps™ 2004 Gold for inland fishing. The 900 Series™ does not support
Navionics® Classic Charts.

The 987c SI Combo models also come with a built-in World map with a more detailed
map of North America (Domestic models) or a more detailed map of Europe and
Southeast Asia, including Australia and New Zealand (International models).

Your 987c SI Combo model uses the GPS Receiver to determine the position of the boat
automatically, and uses the zoom level settings on a particular view to select the best
chart to display. See

Viewing Cartography

for more information.

MULTI-MEDIA CARD (MMC)/SD SLOT

The 900 Series™ 987c SI Combo models support
cartography, and have two multi-media card (MMC)/SD
slots. Optional-purchase MMC and/or SD cards can contain
additional detailed maps. You can also export navigation
data from your unit onto an MMC/SD card (see

Navigation

Main Menu: Export All Nav Data

). If you insert an MMC or SD

card that contains a more detailed chart for a particular
location, your unit will retrieve that chart and display it
automatically.

981c SI models have one MMC/SD slot and do not support cartography.

On any model, use the MMC/SD cards to update the software version of your control
head. To update the software in your control head, plug in the appropriate MMC/SD
card that contains a software update file; the unit will recognize it, will tell you what
software version your control head is currently running, and will ask you if you want to
update the software in the unit to match that on the MMC/SD card. You can obtain
software updates from the

www.humminbird.com

website.

Multi-Media Card

(MMC/SD) Slot

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