The Mio GPS Navigation System is currently the top selling portable GPS Navigation System in the world. It was first launched in 2003 in selected countries in Europe before being launched in South East Asia. The Mio GPS Navigation System is a Pocket PC based GPS Navigation System with an in-built 20 channel satellite receiver. This is the most powerful satellite receiver currently available in the market anywhere in the world. It enables the receiver to receive satellite signals in almost all conditions, with the exception of being inside a building, underground or in a tunnel. The satellite receiver can penetrate tinted windows, tree cover and bad weather.