JRC JMA-5204 Instruction Manual page 133

3.5 GENERAL OPERATIONS
[II] Parallel Index Line Bearing (Reference Bearing)
Parallel index line bearing mode can be switched.
Procedure 1 Press [RADAR MENU] key.
Press [3] key.
Press [5] key.
3
Press [3] key.
The Parallel Index Line Menu will appear.
2 Press [2] key.
The Reference Bearing mode is switched
between true bearing and relative bearing each
time you press [2] key.
* Bearing in the parallel index line menu will show which is selected,
true bearing or relative bearing.
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