Timex W-268 Mode D'emploi page 274

To calibrate the compass:
1. Pull the crown to its middle position and wait for the
indicator hands to stop moving.
2. Keep the watch level or place it on a level surface (if
the band interferes, place the watch on an inverted
cup). The watch may be face down, but take care to
protect the watch face.
3. Press C (COMPASS) to begin. The 4th center hand
rotates two revolutions to remind you to rotate the
watch. While level, SLOWLY rotate the watch two
revolutions, taking at least 15 seconds per revolution.
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4. When done, press C (Compass), keeping the watch
level. The 4th center hand moves back and forth to
acknowledge the end of calibration and then moves
to the current magnetic declination setting (see
MAGNETIC DECLINATION).
5. If you do not wish to set the magnetic declination,
push the crown in. Otherwise, to have watch
automatically compensate for the declination angle,
turn the compass ring until north is at 12 o'clock.
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