Humminbird 957C Fish Finder User 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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