Hi Harald,
Nice picture! Was wondering whether you used 262 Khz as on the screen, or 455 KhZ, I'd suppose you get even more detail at 455 Khz.
Have tried those depths in the sea with 800 Khz, but that renders a very dark image, though in shallow waters it is amazing what it can do at 800 Khz.
Sent more pics!
Greetings,
Reso