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OSBM Bolt 
OSBM Bolt on boulder [3GL] - presumably replaced in 1978 by new Bolt nearby.
Location
Grid reference: NC 2339 2561.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Boulder.
Waypoint: OS1837.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
12.19km 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 2339 2561.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Boulder.
Waypoint: OS1837.
Neighbouring Flush Brackets
| G1809 | Inchnadamph Hotel 4.36km to the southeast. |
| G1823 | Kylesku Hotel 8.23km to the north. |
| G1822 | Eilean na Rainich 8.64km to the north. |
| G1926 | Kylestrome 8.90km 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.
If you have any corrections or additions to this record, please let us know.