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531450-1_A - 383c_Eng.qxd
11/18/2005
DualBeam PLUS™ Sonar
Your 300 Series™ Fishing System uses a 200/83 kHz
DualBeam PLUS™ sonar system with a wide (60°) area of
coverage. DualBeam PLUS™ sonar has a narrowly
focused 20° center beam, surrounded by a second beam
of 60°, expanding your coverage to an area equal to your
depth. In 20 feet of water, the wider beam covers an area
20 feet wide. The 20° center beam is focused on the
bottom, to show you structure, weeds and cover. The
60° wide beam is hunting for fish in the wide coverage
area. DualBeam PLUS™ sonar returns can be blended
together, viewed separately or compared side-by-side.
DualBeam PLUS™ is ideal for a wide range of conditions -
from shallow to very deep water in both fresh and salt
water. Depth capability is affected by such factors as boat
speed, wave action, bottom hardness, water conditions
and transducer installation.
How GPS and Cartography Work
Your 300 Series™ Fishing System 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.
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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 300 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 300 Series™
Fishing System:
• 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 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 300 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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