Quote:
Originally Posted by Tonnage_Ace
11. Ship's length x 1.852 / time in seconds it takes for ship to pass your optic's vertical line = ship's speed in knots
Works better the closer AOB is to 90*
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The actual number is 1.94 but it is close enough. You can even use 2.0 if you like, at combat ranges <1000 meters, it is will be good enough. If we can use 2.0 for the full length of the ship, we can use 1.0 for half the length of the ship.
Which means if you are cramped for time, try this technique
1. Make sure you sub is either stopped or lined up (000 or 180) to your target
2. Lock the periscope to the target. This will place the optic vertical line in the middle of the ship.
3. At the same time
A. start your stop watch
B. Unlock but don't move the periscope
4. Stop the watch when the butt of the boat crosses the vertical line.
Ship length/time in seconds gives you a pretty close speed in knots but in half the time. Useful if you want to limit exposure of the periscope or you need to shoot fast. This won't be as accurate as using 1.94 for the full length of the ship, but at combat ranges it is often good enough for a last minute check before firing.