- Home
- Marine Electronics
- A051T 2W Class B WiFi & NMEA 0183/2000 AIS Transponder
A051T 2W Class B WiFi & NMEA 0183/2000 AIS Transponder
$657.20 – $676.92Price range: $657.20 through $676.92
Enhance your safety and visibility on the water with our Class B AIS transceiver—perfect for recreational boats, yachts, and fishing vessels
- Low-cost anti-collision and monitoring system
- Receives and processes all AIS message types
- Automatically transmits position, speed, and heading to other vessels
- Silent mode for power saving, privacy, or security
- Supports WiFi connections for up to four devices
- Connects to NMEA 2000 networks for AIS and position data sharing
- Multiplexing additional NMEA 0183 input
- Built-in NMEA 0183 to NMEA 2000 Converter
- Description
- Manual / Drivers
- Technical Info
- Pre-configuration service
- Product Videos
Description
Searching for a must have and essential piece of kit? If yes, then look no further!
The A051T Class B AIS Transponder is the ideal solution to transmit your ship’s information, including; location, name, vessel dimensions, speed etc..
The ideal transponder to fulfil your local Class B legal requirements, as well as for peace of mind and project tracking,
This is the ideal, compact AIS transponder.
 In addition to transmitting your AIS information to local boats and receiving stations, the A051T will also convert incoming AIS messages (In the same fashion as our AIS Receivers).
The A051T will receive and decode your GPS location as well as the AIS messages from local ships. Combining the AIS and GPS data, you will be able to view which other boats and ships are around and your position compared to them and the coastline.
You can view your AIS and GPS data on:
- Chart plotters via NMEA 0183 or NMEA 2000 backbone
- your laptop, computer or tablet through USB OTG(Android or Linux compatible)
- up to 4 WiFi enabled devices
Features:
- Transmission of vessels own position, speed and heading etc. to other vessels and receiving stations within VHF range
- Receives and processes GPS and all AIS message types
- A method of monitoring the position, speed and heading of other AIS vessels within VHF range
- The ability to plot the progress and changes in heading/speed of other AIS vessels within VHF range on a PC, chart plotter or wireless device.
- AIS Transmitter ‘Standby’ facility to conserve power, or for privacy.
- Low-cost anti-collision / monitoring system
- Complies with all necessary standards under the European R & TTE article
- LED lights give real-time feedback. LEDs flash each time a message is successfully transmitted or received, so you can have confidence the A051T is transmitting your information.
- In addition, you have the option to read the actual ‘raw’ AIS messages received, using our free application OceanCom.
Technical Summary:
- AIS transmission rate:Â 2 Watts, CSTDMA protocol
- AIS receiving range: 40nm
- VHF connector port:Â Standard SO239/UHF Female connector. Connects to an external VHF/AIS antenna (requires standard PL-259/UHF Male Plug)
- GPS connector:Â TNC female bulkhead connector for connection to an external GPS antenna. The A051T includes a built in GPS module and only requires a GPS antenna to be connected
- POWER connector:Â 12 pin POWER/NMEA connector
- POWER supply range: 12V – 35V
- NMEA 0183 output ports:Â For connection to chart plotters and other NMEA0183 compatible equipment as desired.
- USB: Type B USB for easy connecting to your laptop or PC for configuration and data viewing. (Please note, initial configuration may only be performed using a Windows operating system.)
- WiFi Output:Â The NMEA 0183 sentences are also transmitted through WiFi. It support Ad-hoc and Station mode WiFi (with and without a router). No configuration required for Ad-hoc WiFi.
- NMEA 2000 Output:Â Connects to NMEA 2000 networks for AIS and position data sharing.
- LEDÂ lights confirm incoming and outgoing AIS messages, GPS, WiFi and Power
 
Find out whether you need a Class A or Class B transceiverhere.
Perfect for use in all Class B boats (under 300 tonnes etc.): sailing boats or yachts, small fishing boats, etc..
Easy to install and use…
Step 1 – Decide where to put your transponder on your boat
A key advantage of this Class B Transceiver is that we’ve encased it in aluminum – to minimize interference from other equipment. This opens up many more places you can install the A051T, compared to most other transponders.
Step 2 – Choose your power source
The A051T Class B Transponder can be powered by a power supply ranging from 12v to 24v. This covers most power sources used on boats, and is a distinct advantage over transponders that are powered only by a 12v power supply.
Step 3 – What do you want to see?
The Class B Transponder will of course broadcast your location – but in addition it also receives AIS signals from other ships in your area and receives your GPS location.
Your A051T transponder has input ports where you simply connect your aerials.
You will need to install two aerials:
- A VHF antenna – to collect and transmit the AIS data
- (If you want to use the same VHF aerial as your radio communication, simply use a splitter before connection.)
- A GPS antenna – used to pinpoint your accuate location
Step 4 – Transmitting your location (ON/OFF)
As this is a Class B transponder, you can decide when (or if) you want to transmit your location, using STANDBY mode in the Configuration software.
Step 5 –Which screen/s will you connect your A051T transponder to:
- NMEA 0183 Chart plotter via NMEA 0183 output
- Windows or Linux laptop (using the USB input or WiFi)
- Up to 4 wireless devices (phones, tablets or laptops) in Ad-hoc mode WiFi
- Wireless devices through your Access point/router in Station mode WiFi
- NMEA 2000 chart plotter through NMEA 2000 backbone
This Transponder works in both WiFi modes, Ad-hoc and Station modes:

Who will be able to see my transmitted AIS signal?
Nearby ships will be able to view your details using their AIS receiver, even in bad weather and poor visibility.
Around the world, AIS data from most ports, coastlines and internal waterways is uploaded to the internet by the local community. This means that, if you are in one of these areas; your teammates, partners and loved ones will be able to view your location, using one of the free online AIS websites, from anywhere in the world.
Whether for peace of mind or project tracking, this can be very useful. Find out more here.
What’s included?
- 1 x A051T AIS Transponder (class B)
- 1x WiFi antenna
- 1 x 12 pin POWER/NMEA cable
- 1 x USB cable
Available to add to your order:
IMPORTANT: Class B Transponder
AIS transponders themselves don’t need to be registered, however, each requires a unique and official 9-digit Maritime Mobile Service Identity (MMSI) number assigned to the vessel and its owner.
To obtain an MMSI number, you should contact the relevant authority in your country. Different countries have different authorities responsible for this service. If you are not sure, search ‘how to apply for an MMSI in (country name)’
Please Note: The A051T Transceiver will allow you input an MMSI number only once.
Please make sure you input the correct MMSI number before clicking ‘config’, as changes are not permitted after confirming.
Help and Support
For any technical questions regarding this product, you can visit the forum at https://www.quark-elec.com/forums/ and ask us your question,  it’s regularly checked by our technical team and your question may already have been answered there.
Alternatively, contact us directly, with details of your set up and we will be happy to help.
Manual / Drivers
Setup Guide
A051T Basic Setup Overview.
Manual
Detailed technical specifications. (The ‘Technical Application Note’).
.
Drivers
The A051T comes preloaded with drivers.
The driver may automatically install to your device running Windows 10. If not, or you are using an older Windows system, the driver is on the CD provided and as a free download here.
.
Configuration Software
The configuration software is for configuring the A051T.
Technical Info
Technical Specifications
- Standard       IEC 62287,ITU-RM.1371,IEC 60945, IEC 61162
- NMEA OUT 1Â Â Â NMEAÂ 0183Â RS422Â -38400 bps
- NMEA OUT 2Â Â Â Â NMEA 0183 RS232Â Â -38400 bps
- Sensitivity      -109 dBm
- Power           2W
- Channel A Â Â Â Â Â Â CH87B(161.975MHz)
- Channel B Â Â Â Â Â Â CH88B(162.025MHz)
- Input Level      12V-24V
- Transmit Mode  CSTDMA
- Bandwidth       25 KHz
- Bit ratio           9600 bps
- Consumption    < 4 W
Environmental Factors
- Working Temperature  -15℃~55℃
- Store Temperature      -25℃~70℃
- Humidity                0~95% RH at 40℃
- Water resistance        IPx2

Pre-configuration service
THE REQUIRED INFORMATION MUST BE ENTERED INTO THE RELVENTÂ SECTION WITHIN THE CHECKOUT PAGE.
If you order the Pre-configuration service we will pre-configure your transponder with your MMSI number, ship type and any other required information (Particularly useful for customers who do not have access to a Windows system).
NOTE: Some of this information is required by law for CLASS B transponders. The customer is responsible to check what other fields are required in their location.
ALL FIELDS WITHIN THE SERVICE SECTION IN THE CHECKOUT PAGE ARE REQUIRED (failure to do so will result in delays n shipping the order)
.
The following data can be pre-configured.
MMSI – The Maritime Mobile Service Identity number is your unique 9 digit number that is assigned to a DSC (Digital Selective Calling) radio or a transponder unit. See chapter in manual on Mobile Maritime Service Identity.
Ship type – This field should contain a number referring to the type of vessel you are using this transponder on. For example ‘36’ for vessels using sail propulsion. And ‘37’ for pleasure craft (Yacht powered by engine).
GPS (A, B, C, D)
A: Distance from bow to GPS antenna in metres
B: Distance from stern to GPS antenna in metres
C: Distance from port to GPS antenna in metres
D: Distance from Starboard to GPS antenna in metres
(The transponder must know where your GPS antenna is located to make accurate readings.
Be as accurate as possible when writing this information as it will impact on the accuracy of your GPS data.)

IMO – International Maritime Organization number should be entered into this section, if relevant. This can be found on the hull and certificates for the ship.
CALL SIGN – Your vessel’s call sign if relevant.
Draught – The vertical distance between the waterline and the bottom of the hull (keel), with the thickness of the hull included. Draft determines the minimum depth of water a ship or boat can safely navigate.
Name – Name of your vessel.
Message us your required information, either on the order page or via email to info@quark-elec.com.
For your security, ensure you email us from the same email address as you entered in your order.
Product Videos
Unboxing
Introduction
How to Configure
You may also like…
A052T 5W SOTDMA Class B+ WiFi & NMEA 0183/2000 AIS Transponder – without service
$903.65 ($753.04 excl. VAT)
PL-259 Male RF Coaxial Cable(10m/1m)—Fits SO-239 Socket
$17.77 – $31.98Price range: $17.77 through $31.98
AS12 AIS/VHF Fiberglass Antenna
$86.59 – $125.61Price range: $86.59 through $125.61
AS14 Waterproof GPS Antenna
$135.88 ($113.23 excl. VAT)
A015-TX Active VHF Splitter (for AIS transponders)
$273.72 ($228.10 excl. VAT)
Related products
A026-Plus NMEA 2000 AIS Receiver with NMEA Multiplexer + N2K Converter + WiFi + GPS
$374.28 ($311.90 excl. VAT)
AS14 Waterproof GPS Antenna
$80.67 – $135.88Price range: $80.67 through $135.88
A033 Bi-directional NMEA 0183 Multiplexer with SeaTalk
$278.49 ($232.08 excl. VAT)
AS13 2G/3G/4G Outdoor Omni Fiberglass Antenna
$74.59 – $127.66Price range: $74.59 through $127.66
A012 WiFi GPS Receiver & GPS Repeater
$78.86 ($65.72 excl. VAT)
UHF/SO239 (female) to BNC male connector
$10.67 ($8.89 excl. VAT)




















