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A power driven vessel underway must keep out of the way of the following:

• A sailing vessel, under sail only, and vessels propelled by oars or paddles. (Note: when a sailboat has its motor running, it is considered a power driven vessel.)
• A vessel engaged in fishing, whose fishing equipment restricts its maneuverability. This does not include a sport fisher or party boat and generally means a commercial fishing vessel.
• A vessel with restricted maneuverability such as a dredge or tow boat, a boat engaged in work that restricts it to a certain area, or a vessel transferring supplies to another vessel.
• A vessel not under command – broken down.

Each of these vessels must keep out of the way of the next vessel. For example, a sailboat must keep out of the way of a vessel engaged in fishing, which in turn must keep out of the way of a vessel with restricted maneuverability. And everyone must keep out of the way of a vessel not under command.

When two power driven vessels are in sight of one another and the possibility of collision exists, one vessel is designated by the rules as the stand-on vessel and the other is designated as the give-way vessel. The stand-on vessel should maintain its course and speed. The give-way vessel must take early and substantial action to avoid collision.

If it becomes apparent that the actions taken (or not taken) by the give-way vessel are dangerous or insufficient, the stand-on vessel must act to avoid collision.

So, how do you know a risk of collision exists? An example: your boat and another boat are on a course with a constant bearing but a decreasing range. You are both heading to the same point at the same speed. The risk of collision exists if neither of you alter course and/or speed.