The US and EU are working out an agreement (that may be signed as early as this week) to allow both US GPS and EU Galileo satellites to send data on the same frequency, meaning that receivers would be able to get signals from both systems. In theory, this would potentially double the number of visible satellites for a receiver equipped to handle both GPS and Galileo data streams. Although the Galileo system won’t be operational until at least 2012, the agreement will likely be an impetus for manufacturers of receivers to begin to look at the production of devices that could utilize data from both systems.
Via Yahoo! News