The way I find speed is as follows: Time how long it takes the ship to cross the 0 bearing line on the scope. You will need to ID the target because you need it's length ( there is a mod out there that adds ship lengths to the RM). Once this is established, useing some basic math gets you your speed. I find this method not only pretty accurate, but a challenge since you need to correctly ID the target or your calculations will be off. Don't forget, timeing a convoy is simple since once you establish the speed for one of the ships, you have the speed of the convoy. Practice makes perfect!
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