JRC JMA-5352-9R Instruction Manual page 73

PPI
①：Heading device switching
This function switches the heading device.
(GYRO) ⇒ CMPS (Electronic compass) ⇒ G.COM (GPS compass) ⇒ GYRO
GYRO
If the selected heading device is not connected to the equipment, an alarm is issued.
Upper left of the display
2.3 Functions of Software Buttons
2-16
2