Three special EGNOS satellites located in geostationary orbit above Europe transmit a GPS-like signal that improves the GPS accuracy down to 1 to 2 metres. Service guarantee and integrity information is also provided. EGNOS measured performances are beyond initial expectations, another demonstration of the excellence of the European engineers and technology.
Thanks to the geocachingireland forum for the heads up on this.
Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/
  