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How to Set Up the PMP
Note
The PMP is normally set up to automatically compensate for
gyrocompass error. The error may be "dialed in"; this allows the LOPs
and course lines to be plotted without correction.
Follow these steps to set up the PMP. See figures 2-16 and 2-17 on the
next page to see what the scale looks like with 0° gyro error and also
with gyro error dialed in.
Step
1.
2.
3.
4.
Action
Tape the chart you are using onto the chart table by
its comers.
Take the PMP out of its storage box.
Place the mounting plate inside the anchor plate
and tighten the anchor screw to secure the PMP to
the chart table.
Attach the ruler to the PMP by placing the ruler on
the table and sliding it into the attachment arm.
5.
Unlock both the protractor and the scale locks.
6.
7.
Twist the handle to align the ruler with the latitude
line on the chart.
Rotate the bearing scale to the appropriate position.
IF gyro error is... THEN align the scale . . .
Zero
To the 0° index mark
Westerly
To the index mark on the scale to
the left of zero, equal to the
amount of gyro error
Easterly
To the index mark on the scale to
the right of zero, equal to the
amount of gyro error
8.
Lock the bearing scale using the protractor lock
switch.
2-27
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