The installation of a £6 million tidal gauge will help to predict flooding.
The Environment Agency has installed the gauge on a platform 4km offshore in The Wash, close to Sutton Bridge Port.
It completes a national network of 44 gauges that record information about sea levels to provide more accurate forecasts.
It measures tides, predicts flooding, and assesses the impact of climate change more accurately.
The gauge’s information on tide levels will also be used by the harbour authority to help boats navigate through The Wash and the Ministry of Defence as a static marker at the end of their testing range.
Claire Rose, flood and coastal risk management team leader at the Environment Agency, said: “This new gauge has a practical benefit for local communities as the information it gathers on sea levels will help us predict tidal surges and therefore improve our flood warning service.”
The £6m project was funded through Defra’s flood defence Grant In Aid scheme.