Evan - I believe that you are missing the original point that I was making - That DX-7 is the right way to go for float flying since in the vast majority of the cases there is absolutley no frequency control as we are each flying from our individual piers.

Beyond that, to suggest that because someone was flying at a park instead of at a RC field means that they were flying in an unsafe manner is a big stretch. mdflys4fun said that he was flying a $3K helicopter, so I'm going to take it on faith that he knows how to fly it safely. I'll also bet that since the other person was a member of an RC club that he was flying safely too. It is exactly these sorts of situations - as well as at a regulated RC fields (AMA or not) - where the DX-7 and similar technologies wil provide additional safety over anything we have had before.