AIS transponder recommendation for a cruising yacht

Electronics & Navigation Tech
1

I recently upgraded from a receive-only AIS to a Class B+ transponder and wanted to share my experience for anyone considering it.

I went with the Vesper Cortex V1 — it combines AIS transponder, VHF radio, and a WiFi anchor alarm in one unit. Here’s what I think:

Pros:

  • Integrated unit saves panel space and wiring complexity
  • AIS targets display beautifully on any phone/tablet via WiFi
  • Anchor watch alarm has been flawless — saved me once already when my anchor dragged in a squall
  • NMEA 2000 integration is seamless
  • The smartphone app for VHF calls is a game-changer when you’re on deck

Cons:

  • Expensive compared to standalone units
  • The learning curve is steeper than a traditional VHF
  • You’re putting a lot of eggs in one basket — if it fails, you lose AIS and VHF

For anyone sailing between the Balearic Islands, I’d say a transponder (not just receive) is essential. You want the big ferries to see you on their screens.

What AIS are you all running?

2

I run a standard Raymarine Class B transponder linked to my chartplotter. It’s less fancy than the Vesper but it does the job. I agree completely that transmit capability is essential out here — the ferries between Palma and Barcelona come through at 25+ knots and they need to see you.

My concern with integrated units is exactly what you said — single point of failure. I want my VHF to work even if everything else goes down.

3

On the charter boats we have Raymarine AIS integrated with the nav system. I’d add that AIS is also incredibly useful for identifying boats in anchorages — you can see the name and details of every boat around you, which is handy if someone’s dragging towards you at 3am.

For anyone on a budget, even a receive-only AIS dongle plugged into a tablet is better than nothing. The iKommunicate or similar are around €200.

4

I still use an older NASA AIS receiver — just receive, no transmit. This thread is making me think I should upgrade. The ferries are genuinely a concern, especially at night. How difficult was the transponder installation Marco? I’m reasonably handy with electrics.