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Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) from to, with corresponding wavelengths of ten to one meters.

For the tool used to raise paddle gear on canal locks, see Windlass ("lock key").

The windlass is an apparatus for moving heavy weights.

Typically, a windlass consists of a horizontal cylinder (barrel), which is rotated by the turn of a crank or belt.

A winch is affixed to one or both ends, and a cable or rope is wound around the winch, pulling a weight attached to the opposite end.

The oldest depiction of a windlass for raising water can be found in the Book of Agriculture published in 1313 by the Chinese official Wang Zhen of the Yuan Dynasty (fl.

1290–1333).

Electronics is the science of controlling electrical energy electrically, in which the electrons have a fundamental role.

Electronics deals with electrical circuits that involve active electrical components such as vacuum tubes, transistors, diodes, integrated circuits, associated passive electrical components, and interconnection technologies.

Commonly, electronic devices contain circuitry consisting primarily or exclusively of active semiconductors supplemented with passive elements; such a circuit is described as an electronic circuit.

A multi-function display (MFD) is a small screen (CRT or LCD) surrounded by multiple soft keys (configurable buttons) that can be used to display information to the user in numerous configurable ways.

MFDs originated in aviation, first in military aircraft, and later were adopted by commercial aircraft, general aviation (GA), and automotive use.

A power inverter, or inverter, is an electronic device or circuitry that changes direct current (DC) to alternating current (AC).