And several companies had concept and prototype devices that envisioned digital cameras and global positioning system expansion devices that would fit into the SD card slot.

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The minivan he's slowly touring through the cul-de-sacs of suburban Detroit is painted bright orange and its roof rack bristles with electronics: a global positioning system antenna, a laser measuring system and 14 digital cameras.

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Today, they've been supplanted even further by digital compasses that use electronic sensors and devices that take readings from Global Positioning System satellites.

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Among its most recent products include a watch than can receive global positioning system location information, one that doubles as a TV remote control, and one that plays MP3 digital music files.

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