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 TM 55-1905-242-14
0105 00
CALIBRATION (continued)
NOTE
Calibration will not be effective if the vessel is turned too quickly. The vessel's rate of
turn must not exceed three degrees per second.
4.
Put the helm over in the direction to be steered and set the rudder angle so that the vessel's turn rate does not exceed
approximately three degrees per second. Maintain speed and rudder angle until two full circles have been executed.
5.
As the vessel is turning, note that the remote display unit cycles through CAL, a three digit heading, and a three digit
calibration score. In a few rare instances, the latest calibration score digit may change in as little as 36. This is not
indicative of a faulty calibration. Sometimes the last digit may change before the circle is completed. Rapid rollover of
the final digit indicates that the sensor is receiving incrementally better data and is updating memory "on the fly."
6.
Upon completion of the second circle, note the three digit calibration score. The score might read "96x." This means that
the quality of the calibration is superior and the local magnetic environment is relatively benign; the "x" represents the
last calibration and may be any value between 1 and 9. The goal is to have the first and second digits as close to 9 as
possible. Proper location of the processor unit, free from strong local magnetic disturbances, quite often yields a score
of "88x" or better on the first calibration.
7.
Leave the calibration mode by briefly pressing and releasing the SET CRS pushbutton (16). The digital compass will
return to the compass heading display mode.
NOTE
The digital compass must be left ON for at least ten seconds after leaving the calibration
mode. If the unit is turned OFF before ten seconds have elapsed, the calibration factors
will not be stored in memory.
8.
Leave the digital compass ON for at least ten seconds after leaving the calibration mode in order to store the calibration
factors in the memory.
END OF WORK PACKAGE
0105 00-4
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