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Newlyn, Tidal Observatory 
OSBM BOLT FLOOR NEWLYN TIDAL OBSY (NEWLYN TGBM).
Location
Grid reference: SW 4676 2855.
Landranger 203: Land's End & Isles of Scilly, St Ives & Lizard Point.
Waypoint: TIDE01.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Tolcarne,
883.91m to the northwest.
Second Geodetic Levelling, England & Wales (1912-21)
This bench mark was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 15.5880 feet [4.7512 metres] above mean sea level (Newlyn datum). It was included on the Newlyn (Tolcarne) to Observatory levelling line. The surveyor's description was Observatory B.M.
Location
Grid reference: SW 4676 2855.
Landranger 203: Land's End & Isles of Scilly, St Ives & Lizard Point.
Waypoint: TIDE01.
Neighbouring Flush Brackets
| 1565 | Newlyn, South Pier, Tide Gauge Aux 1 50.00m to the southwest. |
| 1520 | Newlyn, South Pier, Tide Gauge Aux 2 220.23m to the southwest. |
| 1574 | Newlyn, Trinity Methodist Chapel 644.05m to the northwest. |
| 1575 | Newlyn, School 735.46m to the west. |
| 1816 | Penzance, New Road 888.43m to the north. |
Second Geodetic Levelling, England & Wales (1912-21)
This bench mark was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 15.5880 feet [4.7512 metres] above mean sea level (Newlyn datum). It was included on the Newlyn (Tolcarne) to Observatory levelling line. The surveyor's description was Observatory B.M.
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