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OSBM Bolt: Hackness 
OSBM Bolt, gun emplacement, centre of parapet, 1.6m W of face of wall.
Location
Grid reference: ND 3427 9107.
Landranger 7: Orkney - Southern Isles.
Structure: Unknown.
Waypoint: OS2113.
The nearest fundamental bench mark is Duncansby Head, 19.79km to the south.
Location
Grid reference: ND 3427 9107.
Landranger 7: Orkney - Southern Isles.
Structure: Unknown.
Waypoint: OS2113.
The nearest fundamental bench mark is Duncansby Head, 19.79km to the south.
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