Actually, after this last trip, with much of it in the fog, I have been really considering a fully active AIS. I had several times that when I would contact an AIS target, (Usually within 2 mile, and when showing a CPA (closest point of approach) within 1/3 mile and TCPA (time to closest point of approach) within 5 minutes, I would contact to verify their acknowledgement of my position, and confirm sighting me on radar, and intention to maintain course. Several times I was told they could not see me, until I advised I was not active AIS but should show on Radar, after which, they would confirm they could see me (based on me telling them my position relative to them (like 1/2 mile off your stbd bow at about your 2 o'clock). Then I would get "Oh yes, now I see you and yes we will maintain course and speed."
Yes, I believe the AIS is a very good resource for increasing safety and if used carefully, it certainly helps with situational awareness.
Harvey
SleepyC:moon