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OSBM Bolt 
NBM OSBM BOLT CUL W SIDE MILL BURN N SIDE RD 5.6M N FENCE (17.842m above Lerwick datum, 2nd order, new 1979).
Location
Grid reference: HU 3783 6551.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Culvert.
Waypoint: OS2630.
The nearest fundamental bench mark is Duncansby Head, 218.58km to the southwest.
Location
Grid reference: HU 3783 6551.
Landranger 2: Shetland, Sullom Voe & Whalsay.
Landranger 3: Shetland, North Mainland.
Structure: Culvert.
Waypoint: OS2630.
The nearest fundamental bench mark is Duncansby Head, 218.58km to the southwest.
If you have any corrections or additions to this record, please let us know.