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OSBM Bolt 
OSBM Bolt on boulder [3GL] - presumably replaced in 1978 by new Bolt nearby.
Location
Grid reference: NC 2361 2416.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Boulder.
Waypoint: OS1836.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
10.73km 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 Ledmore to Laxford Bridge levelling line. The surveyor's description was OSBM Bolt on boulder.
Location
Grid reference: NC 2361 2416.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Boulder.
Waypoint: OS1836.
Neighbouring Flush Brackets
| G1809 | Inchnadamph Hotel 2.97km to the southeast. |
| G1823 | Kylesku Hotel 9.69km to the north. |
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Ledmore to Laxford Bridge levelling line. The surveyor's description was OSBM Bolt on boulder.
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