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OSBM Bolt 
NEW OSBM BOLT CONCRETE BUTT CATTLE GRID 0.3M SW SIDE RD 1.7M NW FENCE (38.111m above Lerwick datum, 2nd order, new 1979).
Location
Grid reference: HU 4496 6294.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Unknown.
Waypoint: OS2633.
The nearest fundamental bench mark is Duncansby Head, 219.71km to the southwest.
Location
Grid reference: HU 4496 6294.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Unknown.
Waypoint: OS2633.
The nearest fundamental bench mark is Duncansby Head, 219.71km to the southwest.
If you have any corrections or additions to this record, please let us know.