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How GPS and Cartography Work
Your 900 Series™ Fishing System also supports GPS and chartplotting, and
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 within +/- 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. Your 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 24
satellites that continually send radio
signals to the earth. Your present
position is determined by receiving
signals from up to 16 satellites and
measuring the distance from the
satellites.
All satellites broadcast a uniquely coded signal once per second at exactly the
same time. The GPS receiver on your boat receives signals from satellites that
are visible to it. Based on time differences between each received signal, the
GPS receiver determines its distance to each satellite. With distances known,
the GPS receiver mathematically triangulates its own position. With once per
second updates, the GPS receiver then calculates its velocity and bearing.
The GPS Receiver included with your 900 Series™ Fishing System allows you
to combine easy-to-use FishingGPS® chartplotter and navigation capabilities
with advanced fishfinding. The following GPS functionality is currently
supported by the 900 Series™ Fishing System when it is connected to the
included 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.
Your 900 Series™ supports Navionics® Gold, HotMaps™ and HotMaps™
Premium on MMC or SD card media.
NOTE: Your 900 Series™ does not support Navionics® Classic Charts, only
Navionics® Gold, HotMaps™, and HotMaps™ Premium.
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