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OSBM Bolt 
OSBM Bolt on culvert.
Location
Grid reference: NC 5499 1928.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Culvert.
Waypoint: OS1716.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1950),
11.85km 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 Lairg to Loch Naver levelling line. The surveyor's description was OSBM Bolt on culvert.
Location
Grid reference: NC 5499 1928.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Culvert.
Waypoint: OS1716.
Neighbouring Flush Brackets
| S7767 | by West Shinness 4.51km to the southwest. |
| G2059 | Crask Inn 6.05km to the northwest. |
| S7766 | Fiag Bridge 8.35km to the west. |
| S7768 | Colaboll ? 8.92km 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 Lairg to Loch Naver levelling line. The surveyor's description was OSBM Bolt on culvert.
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