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OSBM Bolt 
OSBM Bolt in rock [3GL] - presumably replaced in 1978 by new Bolt nearby.
Location
Grid reference: NC 2522 1688.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1832.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
3.48km to the south.
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Ledmore to Laxford Bridge levelling line. The surveyor's description was OSBM Bolt in rock.
Location
Grid reference: NC 2522 1688.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1832.
Neighbouring Flush Brackets
| G1809 | Inchnadamph Hotel 4.75km to the north. |
| G1881 | Ledmore 4.77km to the south. |
| G1880 | Elphin School 6.07km to the southwest. |
| G4385 | Altnacealgach Hotel 6.21km to the south. |
| G1882 | Altnacealgach Hotel 6.21km to the south. |
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Ledmore to Laxford Bridge levelling line. The surveyor's description was OSBM Bolt in rock.
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