As part of the Maritime and Coastguard Agency's Radio Network Infrastructure Replacement Programme (RNIR), the upgraded network, combining full-fibre and microwave technology, will provide improved bandwidth and security across 11,000 miles of coastline.
The first installations began in December 2020, with Bincleaves, Lee-on-the-Solent, Crystal Palace, Humber, Bridlington and Brighton Marina among the first sites switched to the new network.
Stretching from the Shetland Islands to the Isles of Scilly, the updated infrastructure is now complete.
Assistant Chief Coastguard Matthew Leat said:
The national radio network is integral in supporting our mission of preventing the loss of life on the coast and at sea, enhancing our ability to respond to emergencies across the UK.
