Setting Up Sonar; Advanced Sonar Settings - Garmin GPSMAP 546 Owner's Manual

Setting Up Sonar

Use the Sonar Setup screen to define and adjust settings universal to all sonar
screens.
From the Home screen, select Sonar > Sonar Setup.
Scroll Speed—adjust the rate at which the sonar scrolls from right to left
, fast, Medium, or Slow). If using a speed-capable transducer,
(Ultrascroll
™
select auto to have the scroll speed automatically adjust to the water speed of
your boat.
Surface Noise—show or hide the sonar returns near the surface of the water.
Hide surface noise to help reduce clutter.
depth Line—quickly reference a specific depth (Show or Hide). To set the
depth of the reference line, select Show, and then press up or down on the
Rocker.
a-Scope—display a vertical flasher along the right side of the screen.
data bars—show or hide depth, water temperature, water speed (if your
transducer is capable), battery voltage, cruising, navigation, and the compass
tape (page 9).
NOTE: To display water temperature or water speed, the connected transducer
must be capable of measuring water temperature, water speed, or both. Select
auto to display the values.
appearance—customize the display of fish symbols, whiteline, and the sonar
color scheme.
• fish Symbols—set how the sonar interprets suspended targets.
Select to show suspended targets as symbols with background sonar
GPSMAP 400/500 Series Owner's Manual
information.
Select to show suspended targets as symbols with background sonar
information and target depth information.
Select to show suspended targets as symbols.
Select to show suspended targets as symbols with target depth
information.
• whiteline—highlights the strongest signal from the bottom to help identify
the hardness or softness.
◦ Off (default)—turns off whiteline.
◦ High—the most-sensitive setting. Almost all strong returns are
highlighted in white.
◦ 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 or the Depth 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.
Using Sonar
57