About the Study Guide

You are looking at a preview of what’s in the timed Michigan Boat Ed Course. Feel free to look around, but you’ll need to register to begin progress toward getting your Michigan Boating Safety Certificate.

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Stern drive engine
Stern drives have quieter and more fuel-efficient engines.
  • Stern drives are known also as inboard/outboards (I/Os) because they combine features found on both inboard and outboard engines. Stern-drive engines are four-stroke automotive engines adapted for marine use and are mounted inside the boat.
  • A stern-drive engine is attached through the transom to a drive unit (also called an "outdrive") that is essentially the lower unit of an outboard. The engine turns a drive shaft that is attached to a propeller at the other end.
  • Steering of stern-drive boats is controlled by the outdrive, which swivels like an outboard engine to direct propeller thrust.