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OSBM Bolt: Hackness 
OSBM Bolt, culvert, centre of stream, N of road junction.
Location
Grid reference: ND 3317 9085.
Landranger 7: Orkney - Southern Isles.
Structure: Unknown.
Waypoint: OS2114.
The nearest fundamental bench mark is Duncansby Head, 19.77km to the south.
Location
Grid reference: ND 3317 9085.
Landranger 7: Orkney - Southern Isles.
Structure: Unknown.
Waypoint: OS2114.
The nearest fundamental bench mark is Duncansby Head, 19.77km to the south.
If you have any corrections or additions to this record, please let us know.