Humminbird 957C, 917C manual

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.

Your unit also comes with a built-in UniMap™ 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 900 Series™ 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.

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