OSBM Bolt: by Workwell (Orkney) 

OSBM Bolt, Concrete base, E angle of smithy.
Location
Grid reference: HY 3060 0551.
Landranger 6: Orkney - Mainland.
Landranger 7: Orkney - Southern Isles.
Structure: Unknown.
Waypoint: OS2070.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Duncansby Head,
34.65km to the south.
Location
Grid reference: HY 3060 0551.
Landranger 6: Orkney - Mainland.
Landranger 7: Orkney - Southern Isles.
Structure: Unknown.
Waypoint: OS2070.
Neighbouring Flush Brackets
| 12141 | Outbrecks (Orkney) 5.01km to the north. |
| 12151 | Hobbister (Orkney) 8.21km to the east. |
| 12111 | Redlandhill (Orkney) 8.85km to the northwest. |
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