We have about 60 votes, so let me summarize the results:
Of the people responding 59% already have some form of AIS installed, and 27% more plan to install it. Only 14% have no plans for AIS. I'd say that's a pretty high penetration rate already, and even higher if everyone planning installations follows through with them. Yet many people have observed that while boating, very few boats seem to broadcast AIS. Perhaps this says that among all kinds of boat owners, trawler owners are much more likely to have/want AIS that other types of boats? I'm not sure, but it's an impressive turn out.
Of the people with AIS, 59% have transmit/receive, and 41% have receive only. This is more transmit/receive than I expected, but still disappointing. Remember, all those receive-only devices are only useful if boats are transmitting too. Otherwise there is nothing to receive.
Of the people who currently have receive-only AIS, 60% of them say they plan to upgrade to transmit/receive. Power to you! The bigger the pool the better.
Of the people planning to add some kind of AIS, 59% plan transmit/receive, and 41% plan receive-only. Interestingly, this is exactly the same percentage as those currently with receive-only vs transmit/receive. So it looks like a pretty consistent trend in the percentage of people in the transmit/don't transmit camps. Hopefully all the people who install receive-only will get hooked and join the pool of people planning to upgrade.
Oh, one other thing. Only about 5% of the installed AIS systems are Class A. All others are Class B or receive-only (which technically has no classification at all).