Bill from the great website technovelgy pointed me on node explore. Accordinf to this newspapere:

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.

The tone of the script is light, brief but serious - a cross between Radios 2 and 4. (Later, I discover that the material has been written by an ex-BBC producer and narrated by a local radio presenter.)

I move 50 feet towards some flowerbeds and... ping! I'm urged to look up at the fourth window from the left where the 19th-century stunner Emily Smythe - "the most beautiful woman in the West of England!" - once gazed from her bedroom at the rural landscape stretching to the city. The screen shows me her picture. It tells me that men used to swoon at the sight of her. It shows me her bedroom. I walk to the front of the building. Ping! I learn that the writer CS Lewis was a patient here during the First World War, when this became a military hospital.

Why do I blog this? yet another location-based system that can be useful for tourism applications. Might be interesting for clara, dunno whether she knows this already.