RS40-B VHF Radio with Class B AIS Receiver GPS-500 GPS AntennaSee and Be Seen with Integrated AISThe RS40-B includes a Class B AIS transceiver, which not only receives AIS targets but also transmits your boats position to nearby AIS-equipped vessels. This helps other mariners to spot your boat through any conditions, day or night. A built-in AIS receiver monitors the position of other AIS-equipped vessels, helping you to proactively avoid collisions in crowded harbors and waterways. AIS informa