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OSBM Bolt 
OSBM Bolt in rock [3GL].
Location
Grid reference: NC 2388 1221.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1827.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
1.42km 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 2388 1221.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1827.
Neighbouring Flush Brackets
| G1881 | Ledmore 832.95m to the east. |
| G1880 | Elphin School 2.34km to the west. |
| G1882 | Altnacealgach Hotel 2.98km to the southeast. |
| G1879 | Knockan 3.03km to the southwest. |
| G4385 | Altnacealgach Hotel 3.05km to the southeast. |
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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