Manual Targeting not working?

[THEBERBSTER]

fast calculate speed ship with periscope

1. Enemy ship moving at 90ºAOB ~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 ??????