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  HOW
TO
USE
THE
PLOTTING
BOARD
(Cont)
U s i n g the Vernier Scale
In many cases, the index mark does not fall
e x a c t l y on one of the 10-mil graduation
lines of the azimuth scale. When this oc-
c u r s , the operator computing the range
must use the vernier scale to read the
azimuth to an accuracy of 1 mil. Using the
v e r n i e r scale for setting azimuth 5454 is
s h o w n below as an example:
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