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Do not store the watch near any source of magnetism, such as a
computer, appliance, or television, as the watch can take on a magnetic
charge, yielding inaccurate headings. Typical accuracy of wrist-worn
instruments is within +/- 10 degrees.
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 revo-
lutions 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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Note that the amount of time between the two markers must be less
than one minute.
Press B (FLYBACK/RESET) to reset (zero) the chronograph.
When using distances other than one mile or kilometer, multiply the
result by the distance. For example, if you are using two marks one half
mile apart, and the 4th center hand points to 80, the speed is 40 miles
per hour (1/2 x 80).
c ompass calibra tion
Before use, the compass must be calibrated.
Since a compass uses the earth’s magnetic field, you must be aware of
large metallic objects, such as vehicles or bridges, or objects that give
off electromagnetic radiation, such as televisions or computers, which
could affect the magnetic field around the watch. If the compass is
calibrated near such objects, it will only work properly in that same
location. If the compass is calibrated away from such objects, it will not
work properly near them. For best results, calibrate in the area of intend-
ed use.
In calibrating and taking headings, it is important, as with all compasses,
to keep the compass level. Calibrating or taking a heading when the
watch is not level can result in large errors. Also avoid areas that may
exhibit higher than normal concentrations of hard and soft iron, as
they may cause inaccurate headings. Whenever a heading is suspect,
recalibrate.
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