Illegal fishery buoy on the 28 MHz FT8 frequency

Anyone that uses 28 MHz on a regular basis will have heard illegal driftnet fishing buoys which give out a short carrier followed by an id in morse.

Over the last few days, I have heard one on the FT8 frequency of 28.074 MHz (USB). It is shown below in the waterfall plot as a short narrow carrier in amongst all the FT8 signals.

It is a solid carrier for about 10 seconds and is then followed by the letters E H in morse code. (Something like a 10 second dah followed by dit.....dit dit dit dit ). It transmits every 2m 30s.

I only noticed it in the last few days so I presume that it was only recently switched on.

As for the location, these are the FT8 signals I was hearing at the time....

I would guess either the western Med or out in the Atlantic but it's very difficult to know.

Links...
1) IARU Region 1 page on 28 MHz driftnet buoys