Nicholas Roe in The Telegraph:
It’s the size of a postcard and has a small colour television screen with earphones snaking to a slot in the bottom. When I walk a few yards to my right… ping! A bell shrills in my ear and the screen bursts into life.
A cheery voice declares, “You have walked into an interactive area.” And what begins is a visitor experience like no other I’ve had. This tiny electronic prototype, called an Explorer, detects exactly where I’m standing within the 850-acre parkland surrounding Ashton Court, because it’s equipped with an internal Global Positioning System (GPS) based on satellite signals, accurate to within about three yards.
On screen, I see myself as a little red dot moving slowly over the grass. Depending on where I wander, an entirely different heritage or cultural story is presented through a combination of pictures, sound effects and narrative, all related to where I’m standing and what I’m looking at.
I walk to the bottom of the lawn. Ping! With the sweeping façade of Ashton Court spread like a film set, the screen shows me how the building has changed over the centuries, images building upon images as a voiceover explains why the place looks as it does now.
More here.