There is no delay in gps speed. All it needs is 3 satellites to for a speed. Flying, the gps is predictive since you have a given route. Any delay is overcome since it knows where you will be and when.
Boats, may be different, but I honestly don’t know. And I also don’t know if mine has a paddle wheel for river mode... haven’t really crawled that far under it.
As far how it controls the speed, I’m not sure if gps doing it or what. All I know is it works. We don’t get speed fluctuations even when surfing in choppy water or going over a wake. Once it hits the speed, it rarely budges.
Trayson, come down to Texas and come try it! Lol you’ll be a believer!