Another way to measure it is to set your periscope just infront of the ship (this method works best when you are as close to perpendicular as possible with the targets path) Get out the chronometer and when the bow of the ship hits the vertical line in the periscope start the chronometer. DONT MOVE THE PERISCOPE!!! when the Stern of the ship hits the vertical line stop the chronometer. Get out the paper manual that came with the game. Now divide that length by the time and multiply by two. This gives you a pretty good guestimate of the speed (in knots) I always round up to the nearest half a knot to compensate for any errors and angle issues that come up when you are not perfectly perpendicular to the target when measuring. So far so good! It's more accurate than the guess speed button for the US TDC. Havent tried to work out manual targeting on the U-boats yet, been playing around with my Pocket BB too much
