JRC 1500 MKII Instruction Manual page 31

INTERFERENCE REJECTION "ON"
TARGET EXPANDER "ON"
RANGE RING INTERVAL (NM)
RANGE SCALE (NM)
OWN SHIP COURSE DATA
OWN SHIP SPEED DATA SELECTING J-DIAL
LEVEL INDICATOR
TUNE INDICATOR
NAVIGATION DATA
TRAIL "ON" POSITION DATA
GUARD ZONE ALARM "ON"
FIG. 4-3 LAYOUT OF THE SCREEN
24 OPERATION