They also receive similar co-ordinates from any nearby aircraft.
All of which is co-ordinated from a small office in a former stables in the south-west of Scotland.
But since the three mobile operators are state-owned, the extension of coverage is co-ordinated from the centre.
For Clark, today, the realm of unbounded expression is a place of danger, a badland without co-ordinates from which you might never emerge.
Already, he says, he's opened a New York sales office with a staff of six, with a London office to follow, co-ordinated from Bristol.
So far the RAF have contributed to roughly eight per cent of the air strikes co-ordinated from the Udeid combined operations centre.
The Cochrane Collaboration (a global network of scientists co-ordinated from Oxford) has concluded that acupuncture may be effective for treating back and pelvic pain during pregnancy, low back pain, headaches, post-operative nausea, neck disorders and bed wetting.
That will mean merged health and social care, funded by health and wellbeing boards, co-ordinated from refashioned community hospitals, converted into 24/7 hubs for comprehensive community services supported by consolidated GP practices.
"This was no spontaneous action; obviously it was co-ordinated from Sandinista headquarters," said Gioconda Belli, a celebrated poet and internationally acclaimed novelist who dedicated 30 years of her life to the Sandinista cause.
"In addition, critical new security infrastructure is in place at Calais and Coquelles, along with hundreds of new French police officers, Border Force officers and security guards, co-ordinated from a new joint command and control centre in Calais involving law enforcement staff from both countries".
Co-ordinated from an office in Glasgow by the International Network of Street Papers (INSP), it is a way of celebrating the 14,000 people in 40 countries across the world who sell "street papers" as a way of lifting themselves out of poverty.
