Well first off you dont' line up the images.. you place the mirror image ontop of the real ship. Speed is easy enough but I highly suggest a mod so that you can get the quick speed charts. I like to mark off the contact.. hit the stop watch wait five minutes, pull the chart and however much distance the ship traveled in five minutes = knots via a quick and easy read out sheet, WHICH is realistic as these were standard Kreigsmarine issue onboard.
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