What is the maximum legal speed for a vessel when passing within 150 feet of another vessel or a person in the water?

The maximum legal speed for a vessel when passing within 150 feet of another vessel or a person in the water is typically "slow speed" or "no wake" speed, which is defined as a speed that does not create a wake. This is to ensure safety and minimize the risk of accidents or injuries. Specific regulations may vary by state or local jurisdiction, so it's important to check local boating laws for precise speed limits.