Speed, you’re one of those guys that likes to create impossibilities, because you feel it gives you exceptionalism. It doesn’t.... you’re the most long winded dude talking about a trivial, simple matter that I’ve ever met! Your methods and thinking have no common basis for the rest of us. We all know how to time our toy boats and use a GPS. We all understand that it takes a finite period of time at speed for a GPS to register it to an acceptable level. I use radar guns, because I can get continuous readings into and off a corner. You sound like a fairly sharp guy, but your misapplying your intelligence. It’s your boat and your rabbit hole, just spare us the diatribe please.... None of us is going down the hole with you!