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OSBM Bolt 
OSBM Bolt on culvert [3GL].
Location
Grid reference: NC 4257 0103.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Culvert.
Waypoint: OS2012.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1946),
16.03km 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 4257 0103.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Culvert.
Waypoint: OS2012.
Neighbouring Flush Brackets
| G1886 | Oykel Bridge 3.99km to the west. |
| G1917 | Invercassley, West Lodge 4.91km to the east. |
| G1885 | Oykel, School/Post Office 5.54km to the west. |
| G1918 | The Firs 5.78km to the east. |
| G1919 | Achuirghill 6.74km 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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