AIS Class B Overview AIS Class B Transponders AIS Class B transponders were pioneered to offer AIS benefits to smaller vessels. AIS Class B devices offer lower power, fewer receivers and different display options to a AIS Class A transceivers. Coupled with cost savings, AIS Class B devices are ideal for mariners with small pleasure craft or fishing boats. read more … em-trak AIS Class B Transponder B100 The em-trak AIS Class B Transponder B100 is small, light and with multiple interfaces such as NMEA2000, NMEA0183, USB and SD data card the em-trak AIS Class B100 is easy to install and configure. The Class B AIS B100 simultaneously transmits and receives all AIS messages in real time, and comes as standard with stealth mode functionality (transmit on/off). read more … em-trak AIS Class B Transponder B300 The em-trak B300 AIS Class B offers a unique combination of toughness and performance which is ideal for use in harsh commercial marine environments. The B300 is engineered and manufactured specifically to operate reliably and securely in these conditions whilst delivering best in class AIS receive and transmit performance. read more … em-trak AIS Class B Transponder B330 The em-trak AIS Class B Transponder B330 has built-in WiFi and an internal GPS antenna. An external GPS antenna connection is optionally available. The em-trak Class B B330 AIS Transponder is internationally certified. It is waterproof and ruggedised. Designed for internal or external use. read more … em-trak AIS Class B Transponder B350 The em-trak AIS Class B Transponder B350 is ruggedized (IP67 water & weather proof) fully certified AIS Class B transceiver with increased range and reporting frequency – ideal for offshore sailors. Small ultra low power consumption, NMEA0183 & NMEA 2000, integrated GPS antenna. WiFi option avilable. read more … em-trak AIS Class B Transponder B360 The Em-trak B360 is a certified high powered AIS Class B transceiver with long range WiFi connectivity. Ideal for those requiring enhanced AIS transmit capabilities with guaranteed wired and wireless seamless connectivity to their MFD’s, displays and cell phone or tablet APP’s. Ideal for small commercial boat, fishing boat and leisure markets. Simple installation requirements. read more … em-trak em-trak AIS Class B Transponder B400 The em-trak AIS Class B Transponder B400 is an internationally certified AIS Class B SOTDMA transceiver. The em-trak Class B B400 AIS Transponder is a high powered (5W) ruggedized AIS transceiver ideally suited for professional mariners who demand superior performance, functionality and reliability. read more … em-trak AIS Class B – Identifier – I100 The em-trak AIS I100 Identifier is a fully integrated Identifier Class B/CS compatible vessel tracking AIS transceiver. The I100 Identifier has both GPS and VHF antennas integrated within a security sealed, IP68 waterproof ruggedized shell. Power can be supplied from the vessel or independently from its own internal rechargeable battery which gives up to 7 days of continuous operation between charges. read more … AIS Class B Transponders (Continue) The Automatic Identification System (AIS) is an automatic tracking system that uses an AIS transponder on ships and is used by vessel traffic services (VTS). When satellites are used to detect AIS signatures, the term Satellite-AIS (S-AIS) is used. AIS transponder information supplements marine radar, which continues to be the primary method of collision avoidance for water transport. Information provided by an AIS transponder, such as unique identification, position, course, and speed, can be displayed on a screen or an ECDIS. AIS is intended to assist a vessel’s watchstanding officers and allow maritime authorities to track and monitor vessel movements. AIS integrates a standardized VHF transceiver with a positioning system such as a GPS receiver, with other electronic navigation sensors, such as a gyrocompass or rate of turn indicator. Vessels fitted with AIS transceivers can be tracked by AIS base stations located along coast lines or, when out of range of terrestrial networks, through a growing number of satellites that are fitted with special AIS receivers which are capable of deconflicting a large number of signatures. The International Maritime Organization’s International Convention for the Safety of Life at Sea requires AIS Class A to be fitted aboard international voyaging ships with 300 or more gross tonnage (GT), and all passenger ships regardless of size. For a variety of reasons, ships can turn off their AIS Class A transponders. AIS Class B transponders were pioneered to offer AIS benefits to smaller vessels. AIS Class B devices offer lower power, fewer receivers and different display options to a AIS Class A transceivers. Coupled with cost savings, AIS Class B devices are ideal for mariners with small pleasure craft or fishing boats. Class B transceivers offer small vessels all the AIS features of Class A devices, but without some of the requirements needed for larger vessels. Class B devices offer: Lower power transmission output, there are two types: Class B CSTDMA 2-watt: These transponders are the traditional Class B units, have a transmit range of 5-7 miles and use the carrier sense system for getting a transmission slot. Class B SOTDMA 5-watt: This is a new type of Class B transponder. These units transmit with 5 watts of power and typical transmit 10-15 miles. These use the same self-organized slot management system as the commercial Class A transponders. Multiple outputs to different displays Same number of transmitters and receivers as Class A, but used differently One transmitter must be multiplexed to the VHF DSC radio Active GPS antenna can be incorporated in the device Not interfaced to a compass, so heading information rarely transmitted AIS Class B units are designed for smaller vessels with fewer power options, less space and fewer antennas than a large commercial vessel. The lower transmission power means their range is significantly less than a Class A device, but this is compensated by the anticipated stopping distance in an emergency situation of the vessel compared to a large commercial vessel. Also, the devices are a lot smaller than a Class A device, ensuring they can be installed quickly and integrated easily to many different displays. As smaller vessels rarely include a second antenna, most Class B devices need to use an antenna splitter to regulate use of the VHF antenna between the VHF radio and AIS device.