Breitling COCKPIT B50 Mode D'emploi page 113

BEZEL COMPASS SCALE
By indicating the four points of the compass and the courses, this bezel fulfils
several navigational functions.
1. Course memory
This function enables the pilot to "memorize" the course to be followed by placing
the latter opposite the hour-marker at 12 o'clock.
2. Indication of the opposite course
It also enables the user to instantly read off the return direction, shown opposite
the course followed on the outbound flight.
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