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OSBM Bolt 
NEW OSBM BOLT ROCK 5.5M SE SIDE RD 14.7M SW FENCE ANG (23.772m above Lerwick datum, 2nd order, new 1978).
Location
Grid reference: HU 3686 6138.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Rock outcrop.
Waypoint: OS2634.
The nearest fundamental bench mark is Duncansby Head, 214.47km to the southwest.
Location
Grid reference: HU 3686 6138.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Rock outcrop.
Waypoint: OS2634.
The nearest fundamental bench mark is Duncansby Head, 214.47km to the southwest.
If you have any corrections or additions to this record, please let us know.