Note that the DF2200PX "floats", but if you put rechargeables and a 22-gram aluminum carabiner on it, that sinks it. It was "floating" from the carabiner anchor on the bottom of the lake when we found it. 
(The search and recovery we added to our Rescue class taught us well, apparently.)
((Incidentally, did I *really* type "forctory"?))
(The search and recovery we added to our Rescue class taught us well, apparently.)
((Incidentally, did I *really* type "forctory"?))