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OSBM Bolt 
OSBM Bolt in rock [3GL]; OSBM BOLT BOULDER 87.0M SW JUNC OLD RD 8.9M SE RD 14.5M NE SPRING.
Location
Grid reference: NC 2044 1035.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Boulder.
Waypoint: OS1824.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
5.14km 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 2044 1035.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Boulder.
Waypoint: OS1824.
Neighbouring Flush Brackets
| G1879 | Knockan 879.83m to the northeast. |
| G1880 | Elphin School 2.03km to the northeast. |
| G1878 | Knockanrock 2.36km to the southwest. |
| 12091 | Knockanrock 2.54km to the southwest. |
| 11789 | By Feur Loch 3.68km 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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