Is the AIS MOB waterproof and buoyant?

Certified AIS MOB transmitters are waterproof (IP68 or higher).

Most AIS MOB transmitters are not self-floating – they require a buoyancy aid or must be attached to a life jacket. The only exception is the easy2-MOB (and its predecessors, the easyONE and easyONE-DSC). All Weatherdock rescue transmitters are self-floating without a buoyancy aid.