How was the mean sea level estimate used during its observation period in the UK?

The mean sea level estimate in the UK serves primarily as a tide gauge benchmark known as Ordnance Datum Newlyn (ODN). This measurement provides a reference point for various applications, ensuring consistency in tidal observations across different locations. ODN is critical for surveying, navigation, and engineering by allowing for an accurate baseline for studying tides and sea level changes over time.

Using this benchmark, it becomes possible to measure related phenomena, such as changes in coastal landforms and the impact of climate change on sea levels. The data derived from ODN enables a better understanding of tidal patterns and how they affect coastal environments, which is essential for activities like maritime navigation and the construction of waterfront infrastructures.

Other potential uses, such as in academic studies or flood preparedness, while valuable, do not encompass the primary function of mean sea level as a standardized reference for tide measurements in the UK.