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OSBM Bolt 
NBM OSBM BOLT CUL 6.4M SE SIDE RD 4.1M NE C STR (14.892m above Lerwick datum, 2nd order, new 1979).
Location
Grid reference: HU 4340 7368.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Culvert.
Waypoint: OS2625.
The nearest fundamental bench mark is Duncansby Head, 228.40km to the southwest.
Location
Grid reference: HU 4340 7368.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Culvert.
Waypoint: OS2625.
The nearest fundamental bench mark is Duncansby Head, 228.40km to the southwest.
If you have any corrections or additions to this record, please let us know.