Glossary of Boating Terms

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inboard engine

An internal combustion engine often mounted amidships that runs a drive shaft through the hull bottom.

inboard/outboard (I/O)

See stern drive.

inflatable

Capable of being inflated either with air, as in a life raft or life vest.

inflatable boat

A type of boat with air chambers into which air is pumped either manually or automatically for buoyancy, some having rigid bottoms.

inner liner

Smooth-finished, molded fiberglass structure adjacent to the inside portion of the hull.

inverter

Device that changes 12-, 24- or 32-volt direct current (DC) from a battery to 120-volt alternating current (AC).