Not really - it has the same IPX7 waterproof rating as the etrex series. They are both rated for being submerged in one meter of stationary of water for 30 minutes. That's a lot different than getting hosed during a catamaran pitchpole. I wish they would come out with a version that is screwed together with an internal 0-ring seal like my epirb has. Technology CAN bring us a catamaran proof GPS.