Navico NAIS-500 Class B AIS Transceiver With NSPL-500 Antenna Splitter and External GPS AntennaKey Features Class B approved Send & receive Integrated solution Multiple networking connections Waterproof Lightweight Low power consumption Wide voltage range Class B Approved Meets with the strict regulations set out for this class of Automatic Identification System. Send & Receive The NAIS 500 ensures that you are seen and can see on the water by sending a signal to other vessels with your navigational data, whilst you receive data from other