Definition
A magnetic direction-sensing unit mounted in a remote part of the airplane (typically a wingtip or vertical fin) where magnetic interference from engines, radios, and other electrical equipment is minimal. It senses the Earth's magnetic field and electrically transmits the heading information to cockpit instruments such as the Radio Magnetic Indicator (RMI) or Horizontal Situation Indicator (HSI).
Plain English
A small magnetic sensor placed away from the cockpit, in a quiet part of the airplane where metal and electrical equipment won't disturb it. It picks up which way is magnetic north and sends that information by wire to the heading instruments on the panel.
Context Anchor
Seen in instrument systems that use a Radio Magnetic Indicator, where the compass card needs heading information from a sensor mounted somewhere else in the aircraft.
Derivation
‘Remote’ comes from the Latin remotus meaning ‘moved away’ or ‘distant.’ The unit gets its name because it is mounted away from the cockpit — out in a wingtip or tail — to keep its magnetic readings clean before transmitting them back to the panel.
Why Pilots Care
It supplies reliable magnetic heading data to the RMI while avoiding local magnetic interference that would distort cockpit-mounted compasses.
Analogy
It is like having a temperature sensor outside the house and a display inside. The sensing happens in one place, and the reading is shown somewhere else.
Intuition Check
Do not read “transmitter” as a radio broadcaster here. A remote compass transmitter sends heading information to an aircraft instrument; it is not transmitting a voice or navigation radio signal.
Example Sentence 1
The RMI gets its magnetic heading information from a remote compass transmitter located in the wingtip.
Example Sentence 2
During the instrument scan, the heading displayed on the RMI originated from the remote compass transmitter in the left wingtip.