Like I said........'VHF' waterproof and handheld preferably attached to ones person in the event of MOB.
Try using a mobile whilst swimming in the p*ss, in a plastic bag, with cold fingers!!!!!!! Cmon, Codds.........get real. And please don't give people on hear the idea that you will get yourself out of the mire with a mobile.
Loads of Ribneters respect your advise, so please give the 'right' advise!