Anyone who drives around Prague using the car-navigation system will be familiar with the announcement about the loss of satellite signal when entering a tunnel.

To prevent the situation from happening in the future, the city of Prague is currently testing a small device, called repeater, in several places of the Blanka tunnel. Adam Scheinherr is the Deputy Mayor for Transport:

“We are currently testing a new, unique system. We will be transmitting a signal from all accessible satellites, such as GPS, but also from the European navigational system Galileo…

The system is based on technology which is commonly used in buildings, but its use in transportation structures is not that usual, explains Pavel Šourek, technical director of the company Satra, which is responsible for the installation of the repeaters:
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