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Originally Posted by PaulPosition
3) Any good rule-of-thumb for estimating speed based on plotting?
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Hi, and welcome to the forum. I haven't messed with manual targetting yet, but I can answer this one. If you make a mark on your map where the ship is, then use the stop watch and let it run for 3 minutes and 15 seconds and then make another mark you can measure the distance between the 2 marks to get your speed. What I mean is, if the distance measures .7NM that the ship travelled in that 3:15 then the ship is moving at 7 knots, 1.0 would be 10 knots, etc.