My tip might not be of any use, since it depends on how you found the target. I presume contacts reported on the map. If you found it from a map-report and intercepted it you can use the time since the message, and a rough range/bearing-line to target on the map, to get a distance moved since then. That is often accurate enough to turn into a speed. If not, shadow him further (at safe distance) while you try to get on his beam. You'll have to insert the value manually in the TDC/positionkeeper.
Getting course isn't as easy when he's on your beam, unless he moved very far since the mapreport. I mean, draw a bearingline on the map from the map report to the line representing the visual sighting (as best range as you can determine/guess) and see which degrees fit best. Range does not have to be accurate, but would obviously work best. Your best position for getting his course is ofcourse right infront of him or right behind him.
This doesn't give you range. But if you have the above, and only one range/bearing the solution has all it needs.
To sum it up, try to use all the info the map can provide you. Even that which is not immediately appearant. Use the 'memory' it contains.
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