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OSBM Bolt 
OSBM Bolt in rock [3GL].
Location
Grid reference: NC 2963 0829.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS2004.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
7.27km to the northwest.
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Ledmore to Lairg levelling line. The surveyor's description was OSBM Bolt in rock.
Location
Grid reference: NC 2963 0829.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS2004.
Neighbouring Flush Brackets
| G1883 | Allt Eileag Bridge 1.74km to the southeast. |
| G4385 | Altnacealgach Hotel 3.95km to the northwest. |
| G1882 | Altnacealgach Hotel 4.01km to the northwest. |
| G1881 | Ledmore 6.25km to the northwest. |
| G1884 | Lubcroy 8.71km 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 Ledmore to Lairg levelling line. The surveyor's description was OSBM Bolt in rock.
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