Just for fun. Rules of the road..

[bocajemma]

Now to answer the other questions:

Stand on boat = 30ft sport
Give Way baot = 18ft lund

Why?=

Any course correction rigt by the stand on boat will not avoid collision, and a course correction left by the stand on boat just closes the gap faster.

A simple course correction right (or slow down) by the give way boat will avoid collision.