An exceptional feature and should be on every boat in navigable waters. But let's not forget the VHF/DSC is 'line of sight' transmission, and during the best of conditions that limits us to about 25 miles of communication. Let's use the OP's example of Lake Pardee and ask ourselves; 'Do I get 25 miles of line of site there?'. IMHO there is only one 'best' method of summoning emergency assistance while at the lake......SAT phone. Data plans have come down in price and you can buy smaller data packages. With a SAT phone you can get first hand medical advice that just might save a life until the pros arrive. The SAT phone is only necessary on lakes where cell service is not available.