...your reaction mirrors mine. When I first saw the form in an RYA committee I more or less said "do you expect someone to fill in one of these"

Sad to relate the form hasn't changed. But I was also made aware that its very big-ship-ness was obviously deterring all leisure boaters and therefore they weren't filling it in and therefore the prop fouling issue didn't exist! For that reason I thought it best to encourage people to use what appears to be the only way of getting on the map, even if flawed.

Fascinatingly I've since heard of some fairly spectacular incidents with lobster pots and fast ferries (which can struggle if ingesting one up a water jet or catching one across a stabiliser) so one would hope CHIRP is picking that up.

All still reactive of course, but it's obvious too that no-one is running around checking these things on the water. On a cross-Channel recently we got buzzed by a MAFF plane but quite obviously it was on the hunt for illegal fishing, not small craft dropping polyprop and 5-litre washing up bottles.