Gotta agree with Daedric. Although this is a well thought out idea, and may take little time, it really takes away the whole "discovery" end of things. Honestly, even the wiki takes away that end of things too.
You discover things by 2 ways in life. You either have first hand discovering experience or you ask someone else. Go out and discover, and if you arn't sure, then ask someone in game. The latter will actually spawn a much better outcome than the buoys will. Reason being is that with the buoys, people will see them, know that that is a bad zone, and just float away without really talking to anyone. Yet, if someone goes and ask someone else about that zone, it then spawns an RP interaction which could lead onto something much more beautiful that a little buoy could ever do.
I am [The_Angels]Mortis. If you need help regarding the rules, the game, or just need someone to talk to, feel free to contact me on skype or PM me.