First of all, when referring to VHF Nav, we're really referring to 4 systems, 3 of which are
collectively referred to as ILS (Instrument Landing System):
VOR - VHF Omni-Range - This system gives you bearing to a station.
LOC - Localizer - This gives you left/right commands when landing.
GS - Glideslope - This gives you up/down commands when landing.
MB - Marker Beacon - This gives audio/visual reminder information on approach.
|Words on ILS|
|R-2325 - The receiver|
|C - The control|