I couldn't resist the novelty of being able to use my phone to instruct Bartimaeus to set off out of one of the locks, but I hopped on and drove in a more conventional manner before we had left the lock (steering isn't currently available in this mode!). I winded in the marina entrance and we returned to the staircase lock. On our way up, we had met a lone boater going down. He was just exiting the bottom as we returned and was surprised to see it was us again. I was able to give him a small amount of assistance, but he was making excellent time on his own.