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Scope Series 4 RTÉ Two, Thursday, 7.00pm

Celebrity: Matt Willis

Matt WillisMatt Willis, formerly of Busted, has nominated the GPS system as his favourite invention of all time.

GPS (Global Positioning System) is controlled by 24 earth orbiting satellites.

Three satellites will be pinpointed on you at any given time and GPS can locate where you are to within one metre, providing vital locational information in a variety of sectors such as shipping, mountain rescue and the military.

GPS can also be harnessed for more recreational purposes such as Geocaching, a game where people hunt for treasure using the power of GPS.

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