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OSBM Bolt 
OSBM Bolt in rock [3GL] - presumably replaced in 1978 by new Bolt nearby.
Location
Grid reference: NC 2486 1583.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1831.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
2.38km 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 2486 1583.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1831.
Neighbouring Flush Brackets
| G1881 | Ledmore 3.69km to the south. |
| G1880 | Elphin School 5.02km to the southwest. |
| G1882 | Altnacealgach Hotel 5.29km to the south. |
| G4385 | Altnacealgach Hotel 5.29km to the south. |
| G1809 | Inchnadamph Hotel 5.81km to the north. |
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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