The Handbook of Idaho Boating Laws and Responsibilities
The Official Boating Handbook of the Idaho State Parks and Recreation - Web Version
Table of Contents
Scuba divers or snorkelers should display a diver-down flag that marks their diving area.
Vessels must reduce speed to “no wake speed” while within 100 feet of the flag.
Two types of flags are used to indicate diving activity.
A rectangular red flag with a white diagonal stripe is used on Idaho state waters.
A blue and white International Code Flag A (or Alfa flag) must be displayed on vessels on federally controlled waters.