Raymarine GPM400 Reference Manual page 99

Changing the range
You can change the range for each displayed frequency from the Range Adjust toolbar, which gives you control over the range and range-
shift settings.
The DSM automatically adjusts the display to show the shallowest
required range. Alternatively, you can range in or out on the image,
up to the maximum depth displayed on the scrolling bottom and
A-Scope images. Changes to the range affect all fishfinder
windows.
To open the Range Adjust toolbar
1. Press the RANGE button on the G-Series keyboard.
To select manual or auto range mode
1. Open the Range Adjust toolbar.
2. Toggle to AUTO or MAN on the RANGE softkey.
3. Press OK.
Range auto/manual
Range shift
Select frequency high/low
High frequency shift
Range shift
The DSM automatically adjusts the display to keep the bottom in
the lower half of the display window. Alternatively, you can shift the
image within the current range. Changes to the range shift are
reflected in all Fishfinder windows.
To shift the range image
1. Open the Range Adjust toolbar.
2. Press the RANGE SHIFT softkey.
3. Select your desired setting using the rotary controller or
trackpad.
4. Press OK.
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Chapter 8: The Fishfinder