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OSBM Bolt 
OSBM Bolt in rock [3GL].
Location
Grid reference: NC 2281 1202.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1825.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
2.25km 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 2281 1202.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1825.
Neighbouring Flush Brackets
| G1880 | Elphin School 1.26km to the west. |
| G1881 | Ledmore 1.90km to the east. |
| G1879 | Knockan 2.02km to the southwest. |
| G1882 | Altnacealgach Hotel 3.89km to the east. |
| G4385 | Altnacealgach Hotel 3.97km to the east. |
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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