Further on Shane informed me we were approaching a junction and turning left into a narrow opening. He went to the front to spot for the turn, and as there was a bridge blocking any view of the junction itself, to check for traffic. When we were part way through the bridge he waved to me to stop and go back as there was a boat coming. I retreated. Then he waved me forward saying the boat was waiting for us. We were turning towards them so they had quite a wait, while I turned and pulled out of their way, but then as they moved off I saw behind them, coming through the narrow opening were four more boats lined up, so I ended up with quite a long wait for them all to pass through, before I could pass.