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OSBM Bolt 
OSBM Bolt on culvert [3GL] - location (or description) may be wrong; there does not appear to be a culvert at the quoted location.
Location
Grid reference: NN 3006 9866.
Landranger 34: Fort Augustus, Glen Albyn & Glen Roy.
Structure: Culvert.
Waypoint: OS1380.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Loch Tarff,
16.27km 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 Spean Bridge to Loch Tarff levelling line. The surveyor's description was OSBM Bolt on culvert.
Location
Grid reference: NN 3006 9866.
Landranger 34: Fort Augustus, Glen Albyn & Glen Roy.
Structure: Culvert.
Waypoint: OS1380.
Neighbouring Flush Brackets
| G1047 | North Laggan 0.00m to the east. |
| G1048 | Laggan 1.31km to the southwest. |
| G1046 | Invergarry, Telephone Exchange 2.67km to the north. |
| G1045 | Bridge of Oich 6.05km to the northeast. |
| G1044 | Railway Cottage 7.04km 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 Spean Bridge to Loch Tarff levelling line. The surveyor's description was OSBM Bolt on culvert.
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