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OSBM Bolt 
OSBM Bolt on living rock [3GL]; OSBM BOLT ROCK 11.0M E RD 76.0M SE CUL.
Location
Grid reference: NC 2298 2614.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1838.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
12.76km 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 living rock.
Location
Grid reference: NC 2298 2614.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Rock outcrop.
Waypoint: OS1838.
Neighbouring Flush Brackets
| G1809 | Inchnadamph Hotel 5.01km to the southeast. |
| G1823 | Kylesku Hotel 7.69km to the north. |
| G1822 | Eilean na Rainich 8.10km to the north. |
| G1926 | Kylestrome 8.32km 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 living rock.
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