Waste of time Alan. They would be ignored! Only on Saturday, at the end of a pleasant sail I was nosed into the reeds dropping sail. I was standing on the fore deck, my wife on the stern when not one bur TWO MoBos passed within a foot of my transom - at significantly above the speed limit , 6mph at that point. Fortunately I saw them coming, and was able to warn SWMBO and thus avoided an early bath for her! The wash from these two idiots tossed our 28' 2.8 tonne craft all over the place - and they were traveling with the tide!
Oh, and one was a privateer, with, by the sound of it a considerable number of horses under his sole!
Please slow down when passing moored/ stationary boats. It's a safety issue, as well as a matter of courtesy.