Sail a catamaran, when your reaching it you probably have the rearview-option?
Let the cat. run on highspeed!
Then switch to the helmsman-view, allready stunning...
BUTNOW; press the location-camera(when you hit that it stops following(stands still)).
But the cam. now keeps viewing the cat on a steady location(you will see the SPEED).
If this sound diffecult to manage, jus try one of these 3knobs and youll find out the difference of speed with a multihull!