Knowing where the pivot point didn't really help yesterday.
After rising in the lock, the top gate opens, and the boat gently leaves. Towpath is to the right, and on the left there's a permanent mooring for a very nice vintage boat which is rather close to the lock's exit (about 30 ft away). Also on the left to the lock, and behind the vintage boat, is a weir where the water is obviously running down, having the potential to push the boat to the left. Just to make the situation interesting, there's a strong wind coming from the right, pushing the boat towards the moored one.
It's impossible to start to steer the boat until our boat is out of the lock, and is halfway along the vintage boat. In this hairy situation, I wasn't really thinking of the pivot point ? ?
On top of that, a boat appeared in front on the way to enter the lock, my OH hadn't seen it, and didn't hear my screeching to leave the gate open, then of course, with the wind it wasn't easy to get out of the way of the oncoming boat! Boating can be very interesting....