As Pineneedles and Skip said measuring distance between boats with radar or lidar is possible. But a MP can't just invent a technique and have it stand up in court. It has to accurate and repeatable.
Even a cheap marine radar unit will show distance between boats. So if the MP really wanted to, they could probably find a calbrated radar unit and use that. But of course just being less than a 150' away is not a violation. You also need to be going faster than headway speed.
Sounds like a good product to build, I wonder how many I could sell...
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