em-trak B953 Class B AIS Transceiver - 5W SOTDMA w/VHF Antenna Splitter

The em-trak B953 Class B AIS Transceiver is a 5W SOTDMA marine navigation system designed for commercial and recreational vessel operators who require real-time Automatic Identification System capability. This Class B AIS transceiver integrates VHF antenna splitting technology, allowing dual-function operation on a single antenna installation—a critical advantage for vessels with space or mounting constraints.

The 5-watt SOTDMA (Self-Organized Time Division Multiple Access) architecture enables the B953 to broadcast vessel position, course, and speed data to other equipped vessels and shore-based monitoring stations within VHF radio range. SOTDMA collision avoidance coordination is inherent to Class B systems, reducing the transponder's network load compared to Class A installations while maintaining sufficient transmission power for offshore and coastal operations. The integrated VHF antenna splitter eliminates the need for separate antenna runs, simplifying wiring complexity and reducing installation cost—especially valuable on retrofit applications where deck space or cable routing presents challenges.

The B953 serves commercial fishing operations, charter vessels, cargo boats, and serious recreational cruisers operating within coastal and offshore environments where AIS transponder mandates apply or where navigation safety protocols recommend vessel tracking. It is particularly suited for operators prioritizing compact installation, cost-effective compliance with maritime regulations, and reliable identification in congested shipping lanes or high-traffic anchorages.

FCC regulations require all AIS units sold in the U.S. to be programmed with unique MMSI registration numbers by a qualified technician. At the time of purchase, a completed programming form along with a copy of your MMSI registration, FCC Ship Station License, and vessel master or owner signature must be submitted to ensure proper device activation and legal operation.