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The Ocean Signal ATB1 is a Class B+ AIS transceiver using SOTDMA (Self-Organising Time Division Multiple Access) technology. It is designed to improve vessel visibility and collision avoidance for leisure craft, workboats, fishing vessels, and other non-SOLAS vessels. The ATB1 transmits the vessel’s MMSI, position, COG, SOG, heading and vessel information, while receiving AIS information from surrounding vessels.
Unlike conventional 2 W CSTDMA Class B AIS units, the ATB1 provides 5 W transmission power and SOTDMA access, giving it higher transmission priority and faster reporting. Ocean Signal states that position reports can be transmitted as frequently as every 5 seconds at higher vessel speeds.
| Specification | Details |
|---|---|
| Manufacturer | Ocean Signal |
| Model | ATB1 |
| Equipment Type | Class B+ AIS Transceiver |
| AIS Access Scheme | SOTDMA |
| AIS Transmit Power | 5 W / 1 W |
| AIS Frequency Range | 156.025–162.025 MHz |
| AIS Modulation | GMSK, BT 0.4 |
| AIS Receivers | 2 |
| Receiver Sensitivity | −107 dBm @ 20% packet error rate |
| DSC Frequency | 156.525 MHz |
| GPS/GNSS Receiver | High-sensitivity multi-GNSS |
| GPS Acquisition Channels | 99 |
| GPS Tracking Channels | 33 |
| GPS Antenna | External antenna supplied |
| NMEA 0183 | IEC 61162-1 / IEC 61162-2 |
| NMEA 0183 Ports | 2 × RX / 2 × TX |
| NMEA 2000 | Supported |
| USB | Supported |
| Wi-Fi | IEEE 802.11 b/g/n |
| Wi-Fi Frequency | 2.4 GHz |
| Supply Voltage | 10.8–31.2 V DC |
| Operating Temperature | −15°C to +55°C |
| Waterproof Rating | IPX7 – 1 m for 30 minutes |
| Dimensions (W × H × D) | 101 × 162 × 58 mm |
| Compass Safe Distance | 1 m |
| Standards Compliance | IEC 62287-2, IEC 60945 |
| Configuration | Mobile App / Web-based application |
| Typical Class B Transmission Range | Approximately 10 NM, depending on antenna height and conditions |
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