Marine Engines & Boat Covers
Outboard vs. Sterndrive vs. Inboard - Does it matter?
Outboard (O/B) - Removable engine mounted to the transom of the boat.
Sterndrive or Inboard/Outdrive (I/O) - Permanent engine mounted on stern of boat with portion of engine (the outdrive) in the water.
Inboard (I/B) - Permanent engine mounted in the center / stern of boat with only the propeller shaft exposed to water.