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OSBM Bolt 
OSBM Bolt on culvert.
Location
Grid reference: NC 5161 0174.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Culvert.
Waypoint: OS2017.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1946),
7.97km 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 Ledmore to Lairg levelling line. The surveyor's description was OSBM Bolt on culvert.
Location
Grid reference: NC 5161 0174.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Culvert.
Waypoint: OS2017.
Neighbouring Flush Brackets
| G1919 | Achuirghill 2.33km to the west. |
| G1918 | The Firs 3.30km to the west. |
| G1917 | Invercassley, West Lodge 4.32km to the west. |
| G1920 | Claonel 5.78km to the northeast. |
| G1851 | Achinduich 6.73km 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 Ledmore to Lairg levelling line. The surveyor's description was OSBM Bolt on culvert.
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