ATB1 Class B AIS Transceiver
Class B AIS Transceiver
Coastal Cruising, Sailing, Offshore Recreational, Charters
IPx7 (1 meter for 30 minutes)
0.36kg / 0.8lbs
2 Years (plus 1 on registration)
101 x 162 x 58mm
Operational: -5°F to +131°F (-15°C to +55°C)
AIS Transmitter Frequency range:
156.025 162.025 MHz
107dBm for 20% packet error rate
AIS Receiver Frequency range:
Transmit Power (EIRP):
AIS 5 Watt
10.8 31.2 Vdc
High Sensitivity, 99 acquisition/33 tracking
NMEA 0183 [2 Rx, 2 Tx]
1 x USB
1 x WiFi IEC802.11 bgn
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
apps. 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 manufacturers 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
What is the range of AIS?
This varies enormously depending on weather, VHF antenna height etc.
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
How do I configure my CB2 AIS?
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