What information is transmitted?
Position reports (MMSI, Lat, Long, COG, SOG) for Class B (SOTDMA)
- Every 3mins. when SOG < 2 knots
- Every 30s when SOG >= 2 knots < 14 knots
- Every 15s when SOG >= 14 knots < 23 knots
- Every 5s when SOG > 23 knots
Vessel data (Name, call sign, dimensions, type etc.)
This means that if you are moored or in the marina your data may take some time to be visible on other peoples systems. Depending on your location visibility on Marine Traffic or Shipfinder websites may take much longer.Can I use an existing GPS receiver or GPS data instead of installing an additional GPS antenna for the AIS?No.
The use of the internal GPS receiver is a requirement of the AIS regulations. The AIS can be used as a position source output by configuring it to output GPS position data (RMC NMEA sentence) although this is not generally recommended.Can I change the MMSI or vessel details?
Always take great care when entering the MMSI number. Once programmed changing the MMSI number will require the AIS to be ‘unlocked’ by contacting ACR Electronics via the set-up app. This could take up to 2 days. Changing all other details entered is simple using the Mobile or Web based set-up app’s. Download the ACR AIS App on the App Store or Google Play.How do I connect my CB2 AIS to my existing navigation electronics?
The CB2 comes with both NMEA0183 and NMEA2000 communication protocols.To connect using NMEA0183 you will require some suitable connector block and the wiring information for your other manufacturer’s equipment.To connect using NMEA2000 you will require a spur (drop) cable suitable to connect to the DeviceNet (male) connector on the AIS to an existing NMEA2000 backbone. An unused connection on the backbone must be available.What type of radio antenna should I use?
The CB2 AIS transmits and receives on the VHF band so any good quality Broad Band Marine VHF antenna will be suitable.There are AIS Tuned antennas available which are suitable but other narrow band or tuned antennas should be avoided. If a single antenna is to be used by VHF radio and the CB2 then an active antenna splitter should be installed.What is the range of AIS?
This varies enormously depending on weather, VHF antenna height etc.
How do I configure my CB2 AIS?
- Typical transmit range for Class B is 10nm
- Typical receive range for Class A targets is 20nm
- Receive range can exceed 100nm in the right conditions
The CB2 AIS needs to be configured by the user to enter the vessels MMSI number and other vessel details.
This can be carried out by a mobile App or a web based program:
- For the Mobile Android version search the Playstore for ACR AIS Config
- For the Mobile iOS vesion search the App Store for ACR AIS Config
- For the Web version click here: CB2 New Configuration Program