Shane asked me to drive for a bit. I wasn’t expecting a sunken boat this time so held on to the driving while he drank his coffee. I saw a white thing floating, it looked like a fender or buoy, but wasn’t marking anything. It came into view as I was coming round a big right hand bend and Shane on the other side of the rear deck said it was a swan. I could see clearly that it wasn’t but he could hardly see it at all. As we snaked round the next sharp left hander, Shane was asking if I wanted to drive into the lock or not. I preferred doing the usual locking job, especially as he was reeling off instructions on going in at an awkward angle. I was trying to concentrate on the corner and the large moored boat and said it sounded like he should drive if I needed all those instructions in advance, and as we swapped over I saw it wasn’t much in advance we were actually at the lock sign. I hadn’t realised this as from my side of the narrow deck on the bend that sign wasn’t visible, but from his standpoint it was. You can’t see ahead where the next bit of the water is at all. Several times both Shane and I have tried to take pictures to show the serpentine nature of the Thames but a photograph did not work. Shane showed me a map of the short section I had been driving.