The following list contains the aeronautical radio beacons that were active in the Republic of Ireland in the mid of the 1950s. This compilation is probably incomplete. All information is outdated and may not be used for navigational purposes.
At this time there were mainly non-directional beacons (NDB). But at Shannon Airport, which was of great importance for North Atlantic air traffic, a VOR was already in test operation. The airports of Dublin and Shannon were equipped with Instrument Landing Systems (ILS).
Radio beacons and airways

Radio beacons Ireland (Source: DoD)
Explanations

Abbreviations
approx. | approximately | |
civ | civil | civil operator |
GP | Glide path | Glide path transmitter |
ILS | Instrument Landing System | (Approach and landing aid) |
IM | Inner Marker | Marker beacon just in front the runway |
kHz | Kilohertz | (Unit for frequency) |
L | Locator | Non-directional beacon for the approach |
LLZ | Localizer | Localizer transmitter |
LMM | Locator Middle Marker | Combination of Middle Marker and Locator |
LOM | Locator Outer Marker | Combination of Outer Marker and Locator |
m | Meter | (Unit for length) |
MHz | Megahertz | (Unit for frequency) |
mil | military | military operator |
MM | Middle Marker | Marker beacon |
NDB | Non-directional beacon | Non-directional beacon on long or medium waves |
NM | Nautical Miles | (Unit for length) |
OM | Outer Marker | Marker beacon |
PRMG | ПРМГ Посадочная радиомаячная группа | Soviet / russian military instrument landing system |
RSBN | РСБН Rадиотехническая система ближней навигации | Soviet / russian military radio navigation system |
SBA | Standard Beam Approach | Approach system, Lorenz system, predecessor of the ILS |
THR | Threshold | Runway threshold (most often with number of runway) |
transf. | transformed | Coordinates were converted from a different reference system, therefore there may be deviations. |
VAR | Visual-Aural Rnange | |
VOR | VHF Omnidirectional Radio Range | |
W | Watt | (Unit for power) |
WGS84 | World Geodetic System 1984 | (geospatial reference system, GPS coordinates) |
Directory
For historical information only, do not use for navigation or aviation purposes!
Dublin: Airport (Aerfort Bhaile Átha Cliath, Collinstown)
Runway 24:
Dublin: Rush NDBN5331 W00607 (approx.), 238°/6.5 NM to THR 24
Google MapsDW, 326 kHz, 30 W
(Ros Eó, An Ros)
Dublin: ILS 24DW, 110.3 MHz
Operated at aerodrome times.
Dublin: LOM 24
238°/3.74 NM to THR 24
Locator: OD, 343 kHz
Outer Marker: Dashes, 75 MHz
Dublin: LMM 24
238°/0.67 NM to THR 24
Locator: C, 362 kHz
Outer Marker: Dot Dash, 75 MHz
Dublin: IM 24
Dots, 75 MHz

ILS approach to Dublin in 1954 - There are three Non-Directional Beacons "DW", "OD" and "C" on the approach course. (Source: DoD)

Dublin Airport in 1954 - The Middle Marker (MM) is located 0.6 nautical miles from the field, the Inner Marker (IM) is located directly at the beginning of runway 24. (Source: DoD)
Eagle Island: NDBN5417 W01005 (approx.)
Google MapsGL, 308 kHz
Operated H+00 and every 6 minutes.
Kilkee: MarkerN5241 W00939 (approx.)
Google MapsDashes, 75 MHz
Limerick Junction: MarkerN5230 W00813 (approx.)
Google MapsDashes, 75 MHz
Mizzen Head: NDBN5127 W00949 (approx.)
Google MapsMZ, 308 kHz
Operated H+01 and every 6 minutes.
Shannon: Airport (Aerfort na Sionna, Limerick)
Shannon: Range/Z MarkerN5242 W00849 (approx.), 284°/3.5 NM to field
Google MapsRange: SA, 352 kHz, 75 W
Z Marker: 75 MHz
Was located near Bunratty. The four predefined courses to the Range were: 014°, 104°, 209° and 307°.
Shannon: VORN5241 W00855 (approx.)
Google MapsVSA, 113.3 MHz
On test.
Runway 23:
Shannon: NDBN5250 W00845 (approx.), 229°/9.3 NM to field
Google MapsEJT, 387 kHz, 25 W
Was located north of Lough Cullaunyheeda, near Tyrera.
Shannon: ILS 23SA, 110.3 MHz
To runway 23 (229°)
Shannon: LOM 23N5246 W00851 (approx.), 229°/3.82 NM to THR 23
Google MapsLocator: OL, 339 kHz
Outer Marker: Dashes, 75 MHz
Was located southwest of Fenloe Lake.
Shannon: LMM 23N5243 W00854 (approx.), 229°/0.56 NM to THR 23
Google MapsLocator: S, 316 kHz
Middle Marker: Dot-Dash, 75 MHz
Shannon: IM 23
Dots, 75 MHz

ILS approach to Shannon, 1954 - On the approach course for runway 23, which is closed today, there are three non-directional radio beacons (NDB) "EJT", "OL" and "S". (Source: DoD)

Shannon Airport, 1954 - The Middle Marker (MM) is at the beginning of the approach lighting, the Inner Marker (IM) directly at the beginning of runway 23. (Source: DoD)
For historical information only, do not use for navigation or aviation purposes!
Tuskar Rock Lighthouse: NDBN5212 W00612 (approx.)
Google MapsTR, 296.5 kHz
Operated H+00 and every 6 minutes.
Island in the St George’s Channel
For historical information only, do not use for navigation or aviation purposes!
Maps

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