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How GPS Works
Your Fishing System 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. Some GPS Receivers also use 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 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 following GPS functionality is currently supported by the Fishing System 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 and waypoints
• Travel a route and navigate from one waypoint to the next.
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