Raymarine GPM400 Reference Manual page 101

8.7 Presentation toolbar
The PRESENTATION softkey gives you access to VRM features (for measuring depth and distance), frequency view selection and a scroll
control. These settings affect the monitor you are working on.
ADJUST P1
SINGLE
View F1/F2/Both
Scroll pause/resume
PRESET 2 PRESET 3
DUAL SHALLOW
Power Auto/Man
VRM
VRM on/off
PRESET 4
PRESENTATION
DEEP
Gain
Gain mode auto/manual (low, medium, high)
Color gain auto/manual
VRM range
VRM depth
View F1/F2/Both
Scroll pause/resume
101
TVG auto/manual
Color threshold
D10564-1
Chapter 8: The Fishfinder