Mee & Mac
Point taken about the range of distances!
Actually, if I were doing this at work, I'd probably set up an exploratory test with a 10 distance point by 10 speed point matrix to see what the unit was capable of, then narrrow at least the speed range down to something like 40 to 65 mph for the actual operational qualification testing. You're also correct about establishing a calibration interval; that would need to be done experimentally, too.
I do think that, in the long run, qualifying the Raymarines (if possible) would be a more practical alternative than hand held radar guns that need to be pointed at a specific boat. That way, the MP could monitor everything in the area simultaneously.
I, too, suspect that the Raymarine setups are good enough to do the job off the shelf, but for use in court that would need to be proven. I also suspect that the MP is not going to be interested in 46 mph vs 45, but will be looking for more like 50 or so as a minimum.
Gavia Immer
It would convince me if I were the Judge, but then, I set up testing programs for process equipment for a living! Actually, I would hope that it would be necessary only to convince one court-appointed expert rather than each judge; I seriously doubt that most judges have much understanding of how radar works but they accept radar gun data anyway!.
Silver Duck