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OSBM Bolt 
NEW OSBM BOLT CUL 5.0M NE SIDE RD SE SIDE BURN 52.5M SE PRODN SE FACE PC (35.639m above Lerwick datum, 2nd order, new 1979).
Location
Grid reference: HU 4125 6311.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Culvert.
Waypoint: OS2632.
The nearest fundamental bench mark is Duncansby Head, 218.06km to the southwest.
Location
Grid reference: HU 4125 6311.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Culvert.
Waypoint: OS2632.
The nearest fundamental bench mark is Duncansby Head, 218.06km to the southwest.
If you have any corrections or additions to this record, please let us know.