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Boat Michigan: Official Michigan boating safety course Michigan Department of Natural Resources logo

Hello, boater! Michigan's online boating course has moved. Click here to go to the latest version of the Boat Michigan course—the official boating safety course of the Michigan Department of Natural Resources.

The following course material is for reference only. Please go to the new course to complete your Michigan certification.

Chapter 4: The Legal Requirements of Boating
Alcohol and Drugs

Michigan law prohibits anyone from boating while under the influence of alcohol or drugs. This includes operating any boat, sailboat, or personal watercraft. Alcohol and drugs cause impaired balance, blurred vision, poor coordination, impaired judgment, and slower reaction times. Alcohol is a major contributor to boating accidents and fatalities. Read more about the effects and risks of consuming alcohol.

It is also unlawful for the owner of a vessel to allow anyone else to operate their vessel if that person is under the influence of alcohol or drugs.

The following conditions determine if you are boating under the influence.

  • If your blood alcohol content is 0.10% or greater by weight of alcohol as determined by a breath, blood, or urine test, you are considered to be under the influence of alcohol.
  • If your blood alcohol content is greater than 0.07% but less than 0.10% by weight of alcohol as determined by a breath, blood, or urine test, a law enforcement officer can consider that fact along with other evidence in determining if you are under the influence.

Michigan law establishes the following penalties.

  • People arrested for boating under the influence are guilty of a misdemeanor. Upon a third conviction within 10 years, a person will be guilty of a felony.
  • If a person boating under the influence causes great bodily injury or death of another person, he or she will be guilty of a felony.

By operating a vessel on Michigan waters, you have consented to be tested for alcohol or drugs if arrested by a law enforcement official.

Don't drink and boat!

Areas of Impairment Due to Blood Alcohol Content (BAC)

Areas of impairment due to blood alcohol concentration

Because you can drink faster than your system can burn off the alcohol, there is an increasing level of alcohol in your blood. This level is referred to as Blood Alcohol Content (BAC).

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Online boating license and certification course last modified: July 13, 2011
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