Raymarine GPM400 Reference Manual page 95

8.6 Display mode settings
When a fishfinder preset is selected, its softkey label changes to ADJUST. Pressing this key allows you to configure the display mode
settings to suit your requirements. (Changes to the display mode are saved with the preset at power-off.)
ADJUST P1 PRESET 2 PRESET 3 PRESET 4
PRESENTATION
SINGLE DUAL SHALLOW DEEP
Adjust F1 / F2
Select option
Zoom
Zoom full/split
Bottom lock
Zoom factor x2/3/4, custom (R)
Full/split
Zoom position auto/manual
A-Scope
Range (rotary)
1/2/3
Bottom shift (rotary)
D10561-1
Chapter 8: The Fishfinder
95