JRC JMA-5912-6 Instruction Manual page 67

PPI
Upper left of the display
About ground and sea stabilization
Speed sensor source is MAN , LOG , 2AXW
If Set/Drift Setting menu is on
If Set/Drift Setting menu is off
Speed sensor source is 2AXG , GPS
: GND (Ground stabilization)
: Sea (Sea stabilization)
: GND (Ground stabilization)
2-2
2.1 Names of Display
2