AIS 200 BF
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Automatic Identification System Blue Force is a common term for own units or friendly forces. The AIS 200 Blue Force is an AIS class A mobile station that also offers secure com- munication in addition to standard AIS functionality. This means that all users of the Blue Force units can monitor each other and be monitored by AIS Base Stations prepared with Blue Force tracking capa- bilities. In secure mode this AIS mobile station will still be able to see all AIS Mobile Stations within the coverage area, but are not revealing own position to other than friendly forces. Secure Mode The AIS 200 BF has three different modes. 2. Receive only mode In mode 1 the AIS unit will act as a standard AIS class A mobile station. In mode 2 the unit will only listen, with- out any transmitting. In mode 3 it will encrypt transmit- ted AIS data, making AIS information hidden for others except Blue Forces units. The vessel's primary GPS receiver will normally be interfaced with the AIS and is used as the main position source. However, the AIS 200 BF also incorporates an "all-in-view" GPS receiver which can be used as back-up Heading Interface Vessel heading as derived from the gyro compass may be interfaced to the AIS. This may require a gyro converter if the heading output from the gyro compass is a stepper or synchro signal and not a serial line signal which uses the NMEA data protocol for data exchange. Dedicated VHF frequencies are used for AIS data com- munication and the range is dependant on the height of the VHF antenna. In order to avoid interference with the ship's VHF voice communication, the AIS VHF antenna must be installed in accordance with IMO require- ments. As the AIS protocol, which utilizes time-slots for transmission and reception of data is being used, a large number of users may use the system at the same time without causing interference problems. Chart and Radar Interfacing AIS can be interfaced to electronic charts or radar pro- vided they support the AIS interface. When interfacing AIS to radar and chart plotters, AIS target information as position, heading course and speed becomes available to the mariner and increase reliability of received naviga- tion data from other vessels. The AIS system provides for text messaging between

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- Three different modes - Receive only mode - Secure mode (Encrypted) - Ship name/Call sign/MMSI/IMO number - Date and time in UTC time of composition of message - Position WGS84; Latitude/Longitude degrees & minutes - Course over ground (COG) in degrees - Speed over ground (SOG) in knots and 1/10 knots - Actual maximum draught in 1/10 of meters - Ship/Cargo (Static and voyage realated data) - Number of persons on board - AIS Messaging, adressed or broadcast Technical specifications Data inputs Gyro compass DGPS corrections Input voltage: Power consumption: Radio module Humidity -...

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