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COMPASS LOCATOR.

COMPASS LOCATOR

- A low power, low or medium frequency (L/MF) radio beacon installed at the site of the outer or middle marker of an instrument landing system (ILS). It can be used for navigation at distances of approximately 15 miles or as authorized in the approach procedure.

Source

FAA Pilot/Controller Glossary →

Related — Navigation.

ABBREVIATED IFR FLIGHT PLANS ABBREVIATED IFR FLIGHT PLANS
AERODROME AERODROME
AERONAUTICAL BEACON AERONAUTICAL BEACON
AIR ROUTE SURVEILLANCE RADAR AIR ROUTE SURVEILLANCE RADAR
AIRCRAFT APPROACH CATEGORY AIRCRAFT APPROACH CATEGORY
Airframe Airframe