Yep, for a Black Dafty (Fwd) Wrecks is right on this one. Plus they used to 'ice-pick'. Google it, 'cos I ain't saying nuffink! Also, on one occassion we were sent out to find 'new model' Soviet boat and after several weeks, failed. It was only later when the records were at JAAC that they found that we had found it - just not tracked it.
Then again I remember hearing my first Charlie and it sounded like a tin box full of bells!