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OSBM Bolt 
NEW OSBM BOLT ROCK 5.0M E SIDE RD 20.0M S FENCE JUNC (40.074m above Lerwick datum, 2nd order, new 1979).
Location
Grid reference: HU 4085 6371.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Rock outcrop.
Waypoint: OS2631.
The nearest fundamental bench mark is Duncansby Head, 218.40km to the southwest.
Location
Grid reference: HU 4085 6371.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Rock outcrop.
Waypoint: OS2631.
The nearest fundamental bench mark is Duncansby Head, 218.40km to the southwest.
If you have any corrections or additions to this record, please let us know.