Quote:
The one hour is not real time. You make your measurment at 125 map mag and at 64 Compression. Check the chart for the KM traveled by the ruler and you have the speed in knots.
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Neither are real time the three minutes

. Just by observing what the target does in 3 minutes game time (Use time compression to accelerate that or not is your choice) is enough to get a very accurate speed estimate. Again, search for threads about that, you will fin lots of useful info