There are 1852 m in a nautical mile. The speed calculation should be as follows (there is an error in the video in this regard):
Target length in m / seconds * 1.944
Why 1.944? It’s because you are measuring in seconds and you need nautical miles per hour. So, you need to multiply by 60 twice, 3600. We need to convert to nm, so we then need to divide by 1852. The effect of these adjustments is 3600/1852, or 1.944.
Written differently:
Target length in m / seconds * 3600 / 1852
Hope that clears things up.
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