Humminbird GR16 - Manual (Page 6)

GR16 GPS Connection Kit
The Humminbird® GR16 GPS Connection Kit includes the following items:
• GR16 GPS Antenna Receiver with 20' (6m) cable
• AS YC("Y") cable for multiple accessory attachment
• Hardware kit for stem or deck mounting
• GR16 GPS Receiver Accessory Manual
NOTE: 10 foot extension cables are available as an optional purchase item. These can be used
to extend the total GR16 Antenna Cable length up to 50 feet.
How GPS and Trackplotting Work
Your Humminbird® 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.
1