Advanced sonar settings – Garmin GPSMAP 400 User Manual
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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 fish 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.
◦
◦
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 magnification.
auto 4x Zoom—four times the magnification.
Manual Zoom—set the depth range of the magnified area
manually. Select
depth
and then use the
Rocker
>
Select
to set
the depth range of the magnified area. Select
Level
and then use
the
Rocker
>
Select
to increase or decrease the magnification of
the magnified area.
bottom Lock—locks the zoom window to the bottom.
Split Zoom—displays the Split Zoom screen (
).
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 fine-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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