Because it is hull mounted and the boat isn't so big the sea state is fairly important.
I have been out trawling around about three times in the last fortnight and think I have found another Catalina. I would have dived it to confirm today but the wind got up as we were coming back from a picnic on a beach in the sun on Morvern
. it is now so foggy the foghorns are going on Lismore and that is pretty rare
This one is slightly deeper and aircraft, because of the small size and condition of them, don't show up very well below about 20m or so.