Ray53 Compact VHF Radio with GPS Raymarine?s Ray53 radio is small in size but big on features and performance. Ray53 is a full-function VHF marine radio with Class D Digital Selective Calling (DSC) and a built-in GPS receiver. Simply program your boat?s MMSI number into the Ray53 and immediately benefit from the enhanced calling and safety features of DSC. The Ray53 supports both NMEA2000 and legacy NMEA0183 networking which enables it to connect with other onboard electronics. Ray53 also supports the connection of an optional remote speaker (A80542) to provide audio at a second location. Ray53 was designed to comply with the latest international regulations and includes a connection point for an optional GPS/GNSS antenna. The optional antenna improves the GPS reception when the radio is mounted below deck, in an enclosed pilothouse, or inside a metal enclosure. Ray53 features an attractive industrial design that complements Raymarine?s Axiom family multifunction displays. The radio includes both a standard trunnion mounting kit as well as surface mounting hardware. Features: Compact marine VHF with Digital Selective Calling Built-in GPS/GNSS receiver with the optionalexternal antenna connection Surface and trunnion mount kits included Compliments the style and design of Axiom multifunction displays