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OSBM Bolt 
OSBM Bolt on living rock below rock face, 98' NW from fence junction, 86' W from SW angle of ruins.
Location
Grid reference: SS 0474 9863.
Landranger 158: Tenby & Pembroke.
Structure: Unknown.
Waypoint: OS0921.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Haverfordwest (1969),
18.89km to the northwest.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Haverfordwest to Carmarthen levelling line. The surveyor's description was OSBM Bolt on living rock below rock face, 98' NW from fence junction, 86' W from SW angle of ruins.
Location
Grid reference: SS 0474 9863.
Landranger 158: Tenby & Pembroke.
Structure: Unknown.
Waypoint: OS0921.
Neighbouring Flush Brackets
| G5112 | Hodgeston 1.89km to the northwest. |
| G5113 | Manorbier, Ashley House 2.05km to the east. |
| G5111 | Little Portclew Farm 2.72km to the west. |
| G5114 | Baldwin's Moor 3.11km to the east. |
| S0603 | Lamphey, Church 3.69km to the northwest. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Haverfordwest to Carmarthen levelling line. The surveyor's description was OSBM Bolt on living rock below rock face, 98' NW from fence junction, 86' W from SW angle of ruins.
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