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60 GPSMAP 400/500 Series Owner’s Manual
Using Sonar
Medium—many strong returns are highlighted in white.
Low—the least-sensitive setting. Only the strongest returns
are highlighted in white.
Color Scheme—select White or Blue. This affects the background
on all sonar screens, but does not change the Temp Log screen.
Advanced Sonar Settings
To adjust advanced sonar settings, press MENU while viewing a
sonar screen.
Pause Sonar—Stops the scrolling of the sonar screen.
To mark a waypoint at a selected depth:
1. While viewing a sonar screen, press MENU > Pause Sonar.
2. Use the Rocker to position the pointer over the sh or structure
you want to mark.
3. Press Select.
From the paused screen, press MENU > Resume Sonar to
continue scrolling.
Range—adjust the range of the depth scale on the right side of the
screen (Auto, or to adjust manually, Manual Range).
Gain
—controls the sensitivity of the sonar receiver (Auto, or to
adjust manually, Manual). To see more detail, increase the gain. If
the screen is cluttered, decrease the gain.
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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:
No Zoom—turns zooming off.
Auto 2x Zoom
—twice the magnication.
Auto 4x Zoom
—four times the magnication.
Manual Zoom—set the depth range of the magnied area
manually. Select Depth and then use the Rocker > Select to set
the depth range of the magnied area. Select Level and then use
the Rocker > Select to increase or decrease the magnication of
the magnied area.
Bottom Lock
—locks the zoom window to the bottom.
Split Zoom—displays the Split Zoom screen (page 57).
Noise Reject (available only when Gain is set to Manual)—reduces
on-screen visual clutter (usually from electrical sources) on the
screen. Select the top slider bar to manually adjust the value of noise
rejection. Manually adjusting the amount of noise that is rejected
helps ne-tune the sonar to show the most detail with the least noise.
When Frequency is set to Dual (and Gain is set to Manual), you
can individually adjust noise rejection for each frequency.
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