Raymarine Ray53 Compact VHF With GPS Marine Radio - Raymarine's Ray53 radio is big on features and performance. Ray53 is a VHF marine radio with Class D Digital Selective Calling (DSC) and internal GPS receiver. Simply program your boat's MMSI number into the Ray53 and immediately benefit from the enhanced calling and safety features of DSC. Features: Compact marine VHF with Digital Selective Calling Built-in GPS/GNSS receiver with a connection point for an optional external antenna NMEA2000 and NMEA0183 networking for integration with onboard systems Audio output connection for optional passive remote speaker (A80542) Surface and trunnion mount kits included Styled to compliment the Axiom family of chartplotter displays