fast calculate speed ship with periscope
1. Enemy ship moving at 90šAOB ~aprox. (side view).
2. Put vertical line of periscope on bow ship and activate stopwatch.
3. When the stern reaches the vertical line.. stop the timer.
then:
Ship length
----------- X 1,85 = Speed in Knots.
time in sec
1. example:
cimmaron class tanker= 190,6 m (length)
time bow--->stern in sec= 38 seconds.
190,6 m
-------- X 1,85 = 9,27 Knots
38 sec
credit acknowledgement to ??????
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