Garmin VHF 300 AIS Waterproof Two-Way Marine Radio (Discontinued by Manufacturer) Two-way hailer system NMEA 0183 and NMEA 2000 compliant Voicemail feature that lets you pre-record a 15-second message and deliver the message to any Digital Selective Calling radio Replay the last 90 seconds of any incoming voice transmission at the touch of a button Detailed data on your surroundings regardless of visibility