IFR: The Instrument Landing System (ILS) – Learn to Fly Blog - ASA (Aviation Supplies & Academics, Inc.)
ILS Approaches
ENR 4.1 Navigation Aids – En Route
Marker beacon - Wikipedia
Pilotscafe Understanding ILS
IFR: The Instrument Landing System (ILS) – Learn to Fly Blog - ASA (Aviation Supplies & Academics, Inc.)
Instrument landing system - Wikipedia
NAVIGATION AIDS · AFMAN11-217v1
How An ILS Works | Boldmethod
United Virtual | Training Department
GoldMethod
ATPL Theory - Marker Beacons Marker Beacons are stations on the ground. When you fly overhead they will let you know by means of a visual or a sound (can be both).
Marker beacon | Article about marker beacon by The Free Dictionary
Radio beacons in Portugal in the 1950s - Military Airfield Directory
LOC, LDA and Back-Course Approaches
The ILS - StudentPilot.com
The Final Approach “Fix” on an ILS – BruceAir, LLC