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OSBM Bolt 
OSBM Bolt on living rock [3GL] - presumably replaced in 1978 by new Bolt nearby.
Location
Grid reference: NC 2374 2831.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1840.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
14.86km 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 on living rock.
Location
Grid reference: NC 2374 2831.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1840.
Neighbouring Flush Brackets
| G1823 | Kylesku Hotel 5.57km to the north. |
| G1822 | Eilean na Rainich 5.99km to the north. |
| G1926 | Kylestrome 6.33km to the north. |
| G1809 | Inchnadamph Hotel 6.83km to the south. |
| S7858 | Lochmoreside 12.31km 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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