Simrad RS40-B VHF Radio w/Class B AIS Transceiver Internal GPS [000-14473-001]RS40 B VHF Radio with Class B AIS Transceiver & Internal GPS See and Be Seen with Integrated AIS The RS40 B includes a Class B AIS transceiver, which not only receives AIS targets but also transmits your boat's 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