That's a good way out to sea
I can sometimes get over the Northern French coast, not today though.
Got the RPi connected to FR24 again since earlier this year, found my sharing key, and now with the higher collinear up again.
The dump1090 Web map seems a little basic compared to Virtual Radar, airplane flags and brand icons available? FR24 site has info of course.
My FR24 Feeder Settings page shows 56 tracked aircraft, and plenty on the List page, but N/A uploaded, presumably they should be feeding to the FR24 site (?)