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OSBM Bolt 
OSBM Bolt in rock [3GL] - presumably replaced in 1975 by FB 11789 nearby.
Location
Grid reference: NC 1826 0726.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1822.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
8.82km 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 1826 0726.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1822.
Neighbouring Flush Brackets
| 11789 | By Feur Loch 104.40m to the north. |
| 12091 | Knockanrock 1.35km to the north. |
| 11786 | By An Leth-allt 1.39km to the southwest. |
| G1878 | Knockanrock 1.60km to the north. |
| G1874 | River Runie Bridge 2.56km to the southwest. |
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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