Aircraft Tracking Avionics

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AIS receiver Page

Receiver devices and accessories equipment to track ships for marine surveillance.

AIS marine radar / navigation systems present the bearing and distance of nearby marine vessels in a radar-like display format, as well as unique identification, position, course, and speed, displayed on a computer screen, and even information about their destination, estimated time of arrival and the dimensions of each vessel.

Range is basically limited by line of sight, the relatively low power of ship transponders and the height and gain of your antenna. Typical range at sea level with a basic antenna is about 12Nm, or with a better antenna at an elevated antenna position is about 20-50Nm.

An AIS receiver requires that your PC or laptop will have loaded suitable plotting software that can understand AIS messages on a serial port, compatible with Windows XP/7/8.

To use an AIS receiver on a boat, without the need for internet connection, you will also need a VHF antenna (or a feed from an existing VHF antenna via a splitter), and a PC compatible GPS receiver (see Antenna & other Accessories  page and Prices & Ordering   page) or an adaptor from an existing boat GPS. Independent mapping software on your computer is still needed.

WEGMATT LLC, USA    dAISy AIS receiver

dAISY AIS receiver with AIS whip (or telescopic) antenna:  Part No dAISy.1kit

All you need to start tracking ships are a PC, Mac or Linux computer, and a clear view of the sea.

dAISy works with OpenCPN (free site - see, Ship Plotter and any other software that accepts serial data input.

dAISy is also well suited for reporting local ship traffic to services like MarineTraffic and AISHub.

With it's small size, low cost and very low power consumption, dAISy is the perfect AIS device for DIY projects built around Raspberry Pi and other single-board computers. dAISy was designed around a modern single chip radio IC. This architecture is instrumental for the low price, small form factor and low power consumption, and can result in longer acquisition time, lower sensitivity and less range than commercial AIS receivers, but with a suitable antenna dAISy is more than adequate to monitor local ship traffic.


         Single channel receiver
         Receiving on channel A (161.975 MHz) and B (162.025 MHz)
         Alternates between both channels through channel hopping (<10ms)
Sensitivity down to -100 dBm         Very low power consumption, less than 100mW in receive mode (<20mA at 5V)
         No drivers required for Windows 10, Mac OS X and Linux (driver available for older versions of Windows)
         38400 baud serial over USB         Does NOT include NMEA 0183 output - for NMEA requirement see Part No dAISy+NMEA below.
         Small size: 63 x 44 x 23 mm         Sturdy aluminum enclosure
         BNC connector for 50 Ohm VHF antenna supplied
Mini-USB connector for data and power (USB cable included)
        The Boat Beacon app on Android now officially supports dAISy - see

For full dAISy manual see

OpenCPN, is a free, open source chart plotter and navigation software, can be used with devices like dAISy to track ships on a map. Any software running on a PC, Mac or small Linux computer that accepts AIS data from a serial input will work with dAISy. For location on map, computer will need input from GPS. (GPS dongles available from ).

Screenshot of OpenCPN with dAISy as AIS receiver


NOT RECOMMENDED to rely on dAISy for navigation and collision avoidance!
dAISy is professionally assembled by
the manufacturer in Seattle, WA, USA, with a 12 month warranty .

dAISy AIS Receiver with NMEA 0183 / RS-422 Adapter option (without antenna): Part No dAISy+NMEA

With this adapter option fitted, the dAISy AIS Receiver can directly talk to chart plotters and other marine electronics. In addition, the integrated DC/DC converter allows power to it from your boat's 12-24V power system, removing the need for a USB power source.

New model to be released


NMEA 0183 / RS-422 output at 5V

NMEA high speed (38400 baud)

NMEA low speed (4800 baud) supported with dAISy firmware 4.07 or higher

Powered from 9-24V or through USB

Drawing approx. 25mA additional current

This adapter was successfully tested with chart plotters (Garmin GpsMap 750s, Standard Horizon CP180i, Samyung N700), NMEA routers (vyacht) and RS-422 routers (Transas 4 port RS-422 to Ethernet). It is expected to also work with other devices that support NMEA 0183 or RS-422 input.

Can use as generic RS-422 adapter

On a technical level, this adapter translates one 3.3V-5V serial input to a 5V differential signal. This means, that it can also be used with your own DIY project in need of RS-422 output.

The differential output is driven by a Texas Instruments UA9638 transceiver. External power is regulated by a RECOM ROF-78E5.0-0.5 9-36V, 500mA DC/DC converter. When using external power, 4.7V will be present  which can be used to power your project with up to 450mA.

Rear view of dAISy receiver with NMEA adapter option                    



Kinetic Avionics SBS-3 receiver (includes AIS marine) - see ADS-B aircraft receiver info page


Compact marine navigation Mariner's Pack  CMP-4   Compact, complete economical, navigation/package for marine surveillance to use with your computer

Complete kit includes:

1) Wegmatt dAISy.1 AIS receiver,

2) GPS USB dongle (GPSUSB-1) - plugs direct in to your computer for location data,

3) Small VHF AIS tuned whip (or telescopic) antenna, obviating the need for having a splitter from another VHF antenna with its associated extra cabling.

 Special package price, for use with your computer and plotting software, as a compact, portable complete marine surveillance/navigation device.

Some very useful 'Frequently Asked Questions' provided by Michael Barrett

I want to watch ships using my laptop from land, what do I need?
You will need a computer with a USB port, an A.I.S. receiver and suitable plotting software such as You will also need a suitable VHF antenna designed to work around 162Mhz.I want to use an AIS receiver on my boat, what do I need?
You will need a computer with a USB port, an AIS receiver and suitable plotting software such as that can decode AIS NMEA 0183 VDM messages. You will also need a VHF antenna designed to work around 162Mhz. You cannot use the same antenna as your marine radio without a splitter.
To plot the ship positions relative to your position your computer will need to know your current position. So you will also need a way of getting your GPS position into the computer. This could be a GPS USB dongle (see
Antenna & other Accessories  page and Prices & Ordering   page ) or you may want to use an NMEA to USB adaptor to connect your boat GPS.   After installation of plotting software and receiver drivers/software, plug in the GPS and receiver .How far can I see ships?
VHF radio, AIS signals are normally line of sight. So it depends on the elevation of your aerial and the curvature of the earth. Normally you will see from 10 to 30 miles. However in special meteorological conditions such as tropospheric ducting (where the signals are bounced and curved around the earth) you can sometimes see ships more than 250 miles away.

Possible Fault remedies found by Mike,

1, Only one USB port on some Toshiba units is a high power supply. If the receiver is not receiving, you should changes to this port. 

2, Plug both GPS and AIS receiver into the same ports every time.

3, The centre box on the Opencpn tool bar is to allow the AIS to be received. You must check this box - X and red icon is replaced by no X and Green and yellow icons.

*What is marine AIS ?
The Automatic Identification System (AIS) is an automated marine tracking & surveillance system used for identifying and locating ships, boats & other vessels.

AIS-equipped systems present the bearing and distance of nearby vessels in a radar-like display format. Information provided by AIS equipment include unique identification, position, course and speed, can be displayed on a computer screen, together with information about their destination, estimated time of arrival and even the dimensions of each vessel.

The International Maritime Organization's International Convention for the Safety of Life at Sea (SOLAS) requires AIS to be fitted aboard all international voyaging ships with gross tonnage  of 300 or more, and all passenger ships regardless of size. It is estimated that hundreds of thousands of vessels now carry AIS equipment.

 * Export Prices: for New Zealand, and countries outside Australia, contact us for special  (GST exempt) prices, including postage.  

         ( Please check that ADS-B or AIS receivers are allowed to be imported in to your country, and if there are any duties or extra charges applicable.)

* Stock of  receivers & antenna accessories carried in Melbourne for prompt delivery - we aim to despatch within 1 working day.

* Our prices include GST for Australia only - (GST free outside Australia) and free Postage to anywhere in Australia for orders over $60 . Can send by Express Post in Australia for $2.50 extra, up to 3KG.

* No surcharge for Visa or Master Card

* 12 months warranty- backed by us and the manufacturers

Aircraft Tracking Avionics email:

 Contact us/ Links

A.T.A.:    ABN: 56006167399 (established 1983)


( Enquiries from interested resellers welcome )