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OSBM Bolt 
OSBM Bolt in rock [3GL] - probably replaced in 1975 by new Bolt nearby.
Location
Grid reference: NC 1943 0979.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1823.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
6.29km 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 Ullapool to Ledmore levelling line. The surveyor's description was OSBM Bolt in rock.
Location
Grid reference: NC 1943 0979.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1823.
Neighbouring Flush Brackets
| G1878 | Knockanrock 1.25km to the southwest. |
| 12091 | Knockanrock 1.46km to the southwest. |
| G1879 | Knockan 2.03km to the northeast. |
| 11789 | By Feur Loch 2.68km to the southwest. |
| G1880 | Elphin School 3.10km 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 Ullapool to Ledmore levelling line. The surveyor's description was OSBM Bolt in rock.
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