I play with map contacts off. I get all my speeds from plotting. I do relative motion plots, rather than dynamic plots on the in-game nav map. Take a range and bearing. Plot it off to the side on the nav map, using the in-game tools, using a stationary point as Own Ship. Take another, measure distance covered. Use the nomograph to estimate relative speed. Do vector addition to take into account your motion, if any, and you will get an estimate of both a true course and a true speed. Then repeat as needed to hone solutioin. Take the readings whenever you like without worrying too much about getting them at just the right time and trying to rush through to process as is needed if you dynamically plot on the nav map.
Rather than doing this in-game you can also use the great MoBo tool that you can find like to right here at Subsim. In the Mobo materials you can find links to documents on the web that will teach you all you want to know about the subject, at least for purposes of this game.
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