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OSBM Bolt 
OSBM Bolt on living rock [3GL] - presumably replaced 1978 by new Bolt nearby.
Location
Grid reference: NC 2337 3297.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1844.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Laxford Bridge,
13.76km 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 on living rock.
Location
Grid reference: NC 2337 3297.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1844.
Neighbouring Flush Brackets
| G1823 | Kylesku Hotel 936.22m to the northwest. |
| G1822 | Eilean na Rainich 1.36km to the north. |
| G1926 | Kylestrome 1.97km to the northwest. |
| S7856 | Lochmore Lodge 8.75km to the northeast. |
| S7857 | Achfary 8.91km to the northeast. |
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 on living rock.
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