I like HItman's approach of measuring the time it takes for the vessel to pass the same spot in the scope. It is much quicker than the 3 minute rule and is not dependent upon getting a good range reading. Getting close is always a good thing because it minimizes the effect of any inaccuracies in your solution. I would recommend keeping "map contacts on" so that you can check your solution on the attack map to see how good you are getting
Good Luck!
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