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OSBM Bolt 
NBM OSBM BOLT ROCK 10.7M NE SIDE RD 38.2M SE C CUL (85.454m above Lerwick datum, 2nd order, new 1979).
Location
Grid reference: HU 4706 5840.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Rock outcrop.
Waypoint: OS2635.
The nearest fundamental bench mark is Duncansby Head, 216.82km to the southwest.
Location
Grid reference: HU 4706 5840.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Rock outcrop.
Waypoint: OS2635.
The nearest fundamental bench mark is Duncansby Head, 216.82km to the southwest.
If you have any corrections or additions to this record, please let us know.