The Handbook of Idaho Boating Laws and Responsibilities
The Official Boating Handbook of the Idaho State Parks and Recreation - Web Version
Table of Contents
In periods of reduced visibility or whenever a vessel operator needs to signal his or her intentions or position, a sound-producing device is essential.
Vessels less than 65.6 feet in length, which includes PWCs, are required to carry on board a whistle or horn or some other means to make an efficient sound signal audible for at least one-half mile.
Vessels that are 65.6 feet or more in length are required to carry on board a whistle or horn, and a bell that are audible for at least one mile.