OSBM Bolt: Waterston, Oil Refinery   

NBM BOLT WKS TP NW SIDE RD JUNC RDS (51.2670m ODN, 1.0m AGL, 3rd order, verified 1971).

Location
Grid reference: SM 9324 0528.
Landranger 157: St David's & Haverfordwest.
Landranger 158: Tenby & Pembroke.
Structure: Unknown.
Waypoint: OS2862.

Neighbouring Flush Brackets

G5100	Milford Haven, Pill Road 2.48km to the northwest.
G5099	Steynton, Hayguardhay Farm 2.94km to the northwest.
G4919	West Popton Farm 3.31km to the southwest.
G4977	Milford Haven Tide Gauge Aux 1 4.06km to the west.
S7941	Pembroke Dock, Barracks 4.06km to the east.

The nearest fundamental bench mark is Haverfordwest (1969), 11.03km to the north.