When you start doing equations for quantum physics in a gravatational vortex representing the bending of space/time, believe me, being good at maths is out the window. You have to start thinking so weirdly and outside the box, it is difficult for the 2+2=4 logical thinking guy's to get a grasp of.
Now if a boat was a black hole, (which it has been proven by swallowing up your money
never to see the light again) then all we need is a "white hole". This is the opposite to a black hole. (Proven to be able to exist on paper, but not known to exist in nature). However, it is the theory of black hole and white hole with a space/time connection between them, that supports the theory of a wormhole that could be traveled through. (once again, wormhole theory can be proven on paper, but not in nature). So the result would be, your boat would travel from one point to another. The down fall is distance and time. You could cross the start line at the local race
meet, blink and your in a different universe, round the marker and back across the line all in seconds. Unfortunately, those back here on earth have all aged a few million years and they would have all forgotten what the race
was all about and who the heck won it in the first place.