Like I said, you need a subscription to activate the ais overlay. Simple as that.
Thank you for the definitive answer, your time and effort is appreciated
Not much good where you really need it offshore crossing TSSs etc. I have a Yakker Wi-Fi bridge fed from my SH VHF.
I don’t know why you’re getting your knickers in a twist over this. Instead of messing about with your various gadgets you could just have gone to the Navionics site where it clearly states:
The class b transponder function is interesting. Do you happen to know how frequently it sends out your data? Is it sending it out to somewhere that other vessels will routinely receive it or just to some internet place where apps get their data? If the OOW on the LNG tankers and Irish ferry around Milford Haven could see me on their AIS I’d be interested in that app in addition to my hardware AIS receiver
Although the supplier says they operate their own network of shore based Internet linked receivers, the system appears very similar to Marine Traffic etc.
AIS also has some inherent latency, but Marine Traffic has far greater delay than is strictly necessary. (Likely because it's also incorporating historical data rather than intending to provide a real-time feed). Here's a comparison between MT (background) and a nav app (foreground) consuming a dedicated feed I suspect is similar to Boat Beacon's:
