An array of ground-based radio stations designed to help ships stay on track in the event of a GPS outage have been activated in Britain.
The seven stations overlook the sea from Aberdeen in the north to Dover on the south coast, and can beam low-frequency pulses at vessels to help them avoid collisions.
Vessels usually rely on the GPS satellite system to determine their locations, but temporary outages can be caused by solar storms and people using jamming devices.
The system is a variation of the Long Range Navigation technology used by trans-Atlantic convoys during the Second World War.
Several other countries are considering whether to set up their own versions of the system, including South Korea, which was jammed by its northern neighbour in 2012.
The signal from one of the ground radio stations is one million times stronger than a signal from a satellite.
The system is likely to be extended to the west coast and Ireland within six years.
The system is owned and operated by the General Lighthouse Authorities, which said in a statement: "Signals are vulnerable to interference and both deliberate and accidental jamming, which is causing increasing concern because of the wide availability of GPS jammers online."
Jammers can be purchased for as little as £30.
It added: "With this network we'll be able to guarantee the seamless operating of shipping even if GPS goes down."
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