One form of the technology can read 30 notes a second, although the tags have to be separated from each other by a distance of at least 2cm to reduce interference.

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The series had scant regard for form of any kind - sets were left half-built, costume department tags remained on the actors' outfits and sketches were abandoned in mid stream.

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Like most prototypes, the the SWAN (System for Wearable Audio Navigation) is pretty bulky in its current form, with a laptop, GPS, inertial sensors, pedometer, RFID tags, RF sensors, a compass, and other gear all stuffed into a backpack, although they're apparently already working on a smaller version.

ENGADGET: SWAN: System for Wearable Audio Navigation