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34 GPSMAP
®
2008/2108 Owner’s Manual
Us i n g so n a r
capable), cruising, and navigation.
NOTE: To show water temperature or water
speed, change the setting to Auto. If the
connected transducer is capable, the data is
shown.
Advanced Sonar Settings
To adjust advanced sonar settings, press while
viewing a sonar screen.
Range—the range of the depth scale on the right side
of the screen (Auto or Manual Range).
Gain—controls the sensitivity of the sonar receiver
(Auto or Manual Gain). To see more detail, increase
the Gain. If the screen is cluttered, decrease the Gain.
Beam—when using a dual beam transducer, select a Wide
or Narrow beam.
Frequency—when using a dual frequency transducer,
select how the frequencies appear on screen (200kHz,
50kHz, Dual, or Auto).
Zoom—zoom in to a section of the Full Screen.
The zoom is off, or set to No Zoom by default. Four
options are available:
• 2x Zoom—twicethemagnication.
• 4x Zoom—fourtimesthemagnication.
• Bottom Lock—locks the zoom window to the
bottom.
• Split Zoom—opens the Split Zoom screen.
Depth Line—quicklyreferenceaspecicdepth(On
or Off).
A-Scope—(dual frequency only) averticalasher
along the right side of the screen (On or Off).