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OSBM Bolt 
OSBM Bolt in rock [3GL] - presumably replaced in 1978 by new Bolt nearby.
Location
Grid reference: NC 2318 2715.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1839.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
13.75km 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 2318 2715.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1839.
Neighbouring Flush Brackets
| G1809 | Inchnadamph Hotel 5.87km to the south. |
| G1823 | Kylesku Hotel 6.68km to the north. |
| G1822 | Eilean na Rainich 7.10km to the north. |
| G1926 | Kylestrome 7.34km 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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