come on CAPTBRIAN, you were tested on this.......right???

Crossing Situation
(OAC 1501:47-2-15)
When two power-driven vessels are crossing and risk of collision exists, the vessel which has the other on its starboard side shall keep out of the way and shall avoid crossing ahead of the other vessel.

A vessel crossing a river shall keep out of the way of a power-driven vessel ascending or descending the river.

If a vessel is on your port side and you are on a collision course, you have the right away.