Ninja Turtle...
here is a simple and straight forward formula i have been using all these years.
1. Come to a complete stop as close to zero speed as possible...
2. While watching the ship through the periscope or UZO, Place the vertical cross hair slightly ahead of the ship. Start the stopwatch when the ships bow touches the periscope's vertical cross hair.
3. Stop the stopwatch when the ships stern crosses the periscope's vertical cross hair. (make sure not to move the scope or UZO at all)
4. make a note of this "Traverse Time" it will usually be something like 30 or 45 seconds or could be more or less.
5. Check the length of ship as recorded in the recognition manual.
Length of ship, divided by "traverse time" multiplied times 1.94 = target speed in knots
take more than one measurement if you can but this is deadly accurate
Example: Ship is 180 meters long, traverse time was 32 seconds
180 / 32 x 1.94 = 10.9 knots
in this case set 11 knots in the TDC and sink her!
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