If you’re using the God’s Eye view, then manually calculating speed is extremely easy.
To do this, take a fix on your target with the periscope, then mark the bow of the target on the map. Immediately start the stopwatch and time the target for 3 minutes 15 seconds. Then mark the bow of the ship at that point on the map.
With the ruler, find the distance the target has traveled. The distance read directly corresponds to the speed. For example if the target has traveled 0.6 km then the speed is 6 knots. Likewise if the distance is 1.0 km, the speed is 10 knots. Then manually enter the speed into the targeting computer.
If you don’t use the God’s Eye, things get trickier since you have to calculate the angles to the target and target distances yourself, but the same principles apply.
Also, if you are pressed for time and are tracking a fast moving target, you can time the target for 1 minute 37 seconds then multiply the distance traveled by two and arrive at a reasonably accurate speed calc.
If you use this method, there will never be a need to use the notepad. I always calculate speed this way and even without the God’s eye view, I can easily hit a “reasonably” sized ship from 2500 - 3000 meters, although I typically shoot from much closer.
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