Gerry sends:

Precision Digital Altimeter with wireless transmitter and receiver. "If you want to build a standalone altimeter/variometer just for hiking or mountaineering, this setup can obviously be simplified by omitting the wireless components."

http://trash.net/~luethi/microchip/projects/alti/alti.html

Delorme Tripmate GPS Logger: http://semifluid.com/?p=43

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