Garmin GPSMAP 580 Owner's Manual page 82

Setting Up and Using Sonar
Calibrating the Water Speed
4. By default, the top ground speed is automatically shown. If
a ground speed is not available, the top uncalibrated water
speed is used instead. If the new speed is correct, highlight
OK, and press Enter.
If you want to manually enter a calibration, press Enter while
the speed is highlighted, enter a new speed, and press Enter
again.
If the boat is not moving fast enough or the speed sensor is not
outputting a speed, "Boat Is Not Moving Fast Enough To Calibrate"
appears at the bottom of the screen. Check that the speed sensor
wheel is moving or safely increase boat speed. If there is a problem
with the speed sensor or if a speed senor is not installed, "Water
Speed Sensor Is Not Working" appears at the bottom of the screen.
Check connections of speed sensor cables.
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Setting Up the Sonar Display
You can set up how the sonar information appears on-screen using
the Display sub tab.
To access the Display sub tab:
1. On the Main menu, highlight the Sonar tab.
2. Highlight the Display sub tab.
Display sub tab
Scale—allows you to select how and where you want the depth
scale to appear.
Color Bar—allows you to show a gradient scale of the current
Target Level setting on the Sonar Setup tab.
GPSMAP 580/585 Owner's Manual