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Plotting One or More LOPs
Procedure
Follow the steps in the table and refer to the accompanying figures to
plot LOPs.
Step
1.
2.
3.
4.
5.
Action
Plot the AP (assumed position). This is the whole degree of
latitude and the assumed longitude. In our example problem
this would be Lat 37° 00.0' N Long 017° 52.2' W.
Lay off the azimuth line (Zn) from the AP toward or away
from the body, depending on whether the observed altitude
(Ho) is greater or less than the computed altitude (Hc).
Measure in the proper direction, along the azimuth line, the
difference between the observed and the computed altitude in
miles and tenths of miles. This is the value of a or intercept.
Draw a line at the extremity of a, perpendicular (add 90° to Zn)
to the azimuth line. At the time of observation, this
perpendicular line is the LOP.
Label the LOP with the time of observation and the name of
the observed body.
Figure 9-12. Plot the LOP.
9-28
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