WizardHat

Ah, Paravane they seem too be what they are thanks.

hey me and some mates were playing in Phra Ruang when we noticed these on the stern in cranes and wondered if anyone knows what they are? I thought they could be some sonar device like a "electric eel" towed array but that seems unlikely. I then thought it could be an ASDIC system but cant find any pictures or info on any of them to check.