X Marks The Spot

STREET SMART Garmin's Geko 201

Remember treasure maps? Those enchanting childhood props with their promise of buried loot? Now there's a digital equivalent. Equipped with a handheld Global Positioning System (GPS) unit like Garmin's Geko 201 (about €200) — an electronic device the size of a mobile phone that determines the precise latitude and longitude of the holder's position by picking up a radio signal from several satellites — you can take part in "geocaching," a techno-treasure hunt.

Here's how it works. Select the coordinates for a cache — usually a weatherproof container filled with some cheap trinkets — posted on one...

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