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The Boater's Guide of Arizona, A Handbook of Boating Laws and Responsibilities Arizona Fish and Game Department

Boating Basics: Before Going Out

Before going out on the water, take steps to make the outing safe and enjoyable.

Vessel Length Classes

  • A vessel's length class determines the equipment necessary to comply with federal and state laws.
  • Vessels are divided into length classes:
    • Less than 16 feet
    • 16 feet to less than 26 feet
    • 26 feet to less than 40 feet
    • 40 feet to less than 65 feet
  • Length is measured from the tip of the bow in a straight line to the stern. This does not include outboard motors, brackets, rudders, bow attachments, or swim platforms and ladders that are not a molded part of the hull.

Measuring Vessel Length

Measuring vessel length of inboards and outboards

Vessel Capacity

Capacity plate

  • Always check the capacity plate, which is usually found near the operator's position or on the vessel's transom. This plate indicates the maximum weight capacity and maximum number of people that the vessel can carry safely.
  • PWCs and some other vessels are not required to have a capacity plate. Always follow the recommended capacity in the owner's manual and on the manufacturer's warning decal.
  • On vessels with no capacity plate, a simple formula can provide a guide. Multiply length (in feet) by width (in feet) and divide the result by 15. This will give you the maximum number of people at an average weight of 150 lbs. that the boat will accommodate safely under calm water conditions.
Number of people =
 vessel length (ft.)  x  vessel width (ft.)
15

This information can be found on the U.S. Coast Guard Office of Boating Safety website.

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The Boater's Guide of Arizona, A Handbook of Boating Laws and Responsibilities
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Online boating safety handbook last modified: September 17, 2009
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