The Rules of the Road apply when one vessel approaches another, and determine what each vessel must do.
The best defence against collision is keeping a proper lookout at all times by sight and hearing.
Meeting Another Vessel Head-On
If two power-driven vessels meet head-on, both must give way by altering their course to starboard.
If two fishing vessels meet head-on, both must give way by altering their course to starboard.
If a power-driven vessel meets a vessel engaged in fishing head-on, the power-driven vessel must give way. The fishing vessel should maintain its course and speed.