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OSBM Bolt 
OSBM Bolt on living rock [3GL] - presumably replaced in 1978 by new Bolt nearby.
Location
Grid reference: NC 2369 3222.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1843.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Laxford Bridge,
14.51km 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 2369 3222.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1843.
Neighbouring Flush Brackets
| G1823 | Kylesku Hotel 1.75km to the northwest. |
| G1822 | Eilean na Rainich 2.17km to the north. |
| G1926 | Kylestrome 2.75km to the northwest. |
| S7856 | Lochmore Lodge 9.03km to the northeast. |
| S7857 | Achfary 9.28km 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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