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OSBM Bolt 
OSBM Bolt in rock [3GL].
Location
Grid reference: NH 2105 1002.
Landranger 34: Fort Augustus, Glen Albyn & Glen Roy.
Structure: Rock outcrop.
Waypoint: OS1670.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Glen Cluanie,
15.27km to the west.
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Glen Cluanie to Glen Moriston levelling line. The surveyor's description was OSBM Bolt in rock.
Location
Grid reference: NH 2105 1002.
Landranger 34: Fort Augustus, Glen Albyn & Glen Roy.
Structure: Rock outcrop.
Waypoint: OS1670.
Neighbouring Flush Brackets
| G4531 | Loch Cluanie Dam 2.70km to the west. |
| G4532 | Achlain 7.14km to the east. |
| G1771 | Bridge of Loyne 7.76km to the southwest. |
| G1775 | Allt-a-Bhiora Bridge 7.77km to the south. |
| G1774 | Ardochy 7.79km to the south. |
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Glen Cluanie to Glen Moriston levelling line. The surveyor's description was OSBM Bolt in rock.
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