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52 GPSMAP 4000 Series Owner’s Manual
marIne netWork: uSInG Sonar
usInG
sonar
Advanced Sonar Settings
To adjust advanced sonar settings, press MENU 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.
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—twice the magnication.
4x Zoom—four times the magnication.
Bottom Lock
—locks the zoom window to the bottom.
Split Zoom—opens the Split Zoom screen.
Depth Line—
quickly reference a specic depth (On or Off).
A-Scope (dual frequency only)—a vertical asher along the right side of the screen (On or Off).
Sonar Setup—opens the Sonar Setup screen. See page 51.
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