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900 Series™ Introduction
Your 900 Series™ Ultra Wide Screen Chartplotter comes in the following
configuration:
• Humminbird® 955c Combo Chartplotter: Ultra Wide Screen
Networkable GPS Chartplotting System, GPS Receiver included.
How GPS and Cartography Work
Your 900 Series™ Chartplotter 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™ Chartplotter allows you to
combine easy-to-use FishingGPS® chartplotter and navigation capabilities.
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