2023
SN2046 : OS Fundamental Benchmark - Llangoedmor, Cardigan FBM
taken 1 year ago, near to Llangoedmor, Ceredigion/Sir Ceredigion, Wales
OS Fundamental Benchmark - Llangoedmor, Cardigan FBM
Ordnance Survey Fundamental Benchmark (FBM) used for levelling height above Ordnance Datum (OD).
Height (1954): 89.4719m OD (Newlyn). Mark verified by the Ordnance Survey in 1972. Description: CARDIGAN FBM 4.3M S SIDE TK 43M SW CORNER GARAGE. 0.3m above ground. 1st Order BM.
The FBM was used on the Haverford West to Cardigan (G077) and Cardigan to Aberystwyth (G082) lines of the Third Geodetic Levelling of England & Wales in 1954 and 1956 respectively. It was levelled with a height of 293.543' above OD (Newlyn). Abstract G 65:
Link [OS 54/754]
Context:
SN2046 : OS Fundamental Benchmark - Llangoedmor, Cardigan FBM
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