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If you want to both receive other ships' AIS and transmit your own boat's information, you need to look for a transceiver, often called a transponder. A simple receiver does not transmit your position.
Start with the function you want
| Solution | Receives AIS | Transmits own AIS data |
|---|---|---|
| Dedicated AIS receiver | Yes | No |
| AIS transceiver | Yes | Yes, when properly configured and active |
| VHF with built-in AIS | Depends on the model | Must be checked separately |
The Raymarine AIS350 is an example of a receiver. The AIS700 is a Class B transceiver that both receives and transmits. These examples explain the difference; they are not a guarantee of stock status or an automatic match for your plotter.
What are you paying extra for?
With a transceiver, the solution also includes transmitting your own boat information and the requirements that follow regarding configuration, positioning, and antenna. Some models have a built-in antenna splitter, while others require a separate solution.
I would therefore compare complete installations: unit, antenna or suitable splitter, cables, network parts, and setup. The price of the box itself cannot stand alone.
Check the connection to the plotter
Find the exact model and software support of your plotter. Check whether AIS data should be transmitted via NMEA 2000, NMEA 0183, or another supported connection. For example, Raymarine specifies several connection options for the AIS700, but the necessary cables depend on the boat's system.
Example: “My VHF already has AIS”
Before I suggest more equipment, I would investigate whether the VHF only receives or also transmits. If it already receives AIS, a new receiver may be superfluous. If you want to transmit your own information, the next question is whether the existing equipment can do that or if a transceiver needs to be added.
The antenna is part of the system
Plan the antenna connection according to the unit's installation manual. A standard passive splitter is not a universal alternative to a splitter designed for VHF and AIS transmission. Also, check the GNSS antenna requirements and placement for the specific transceiver.
The Raymarine AIS700, for example, has a built-in antenna splitter. This is a model-specific feature that does not apply to all AIS devices.
Use AIS as an extra layer of information
The AIS display shows the information the system receives. It is not a complete picture of all boats and objects around you and does not replace lookouts or other navigation. Correct boat data and MMSI must be clarified during setup.
Send the model of your VHF and plotter, information about the antenna, and your request for reception or both reception and transmission. Then I will help put together a solution without unnecessary duplicate purchases.
Sources and manufacturer documentation
This guide is written by SejlStrøm. Technical information was verified on September 22, 2026. Always use the documentation for the specific model and version.