(31 Jul 2015, 4:05 pm)citaro5284 What happens when they are underground as I would not think the GPS would work say at Haymarket or Monument?
Signal repeaters were installed in the tunnels long before the GPS net stop technology was introduced to allow passengers to use mobile phones in tunnels.
(31 Jul 2015, 4:05 pm)citaro5284 What happens when they are underground as I would not think the GPS would work say at Haymarket or Monument?
Signal repeaters were installed in the tunnels long before the GPS net stop technology was introduced to allow passengers to use mobile phones in tunnels.