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Is it possible, by measuring the signal strength at different locations, or other means, to ascertain the approximate location of a wifi signal?

What software would you recommend to do this? (For me, OSX, but feel free to list others)

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4 Answers

up vote 2 down vote accepted

For OS X there's Kismac.

Another one for Windows that looks cool (I've not had a chance to try this one yet) is Ekahau HeatMapper.

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+1 for the HeatMapper! –  Molly7244 Nov 1 '09 at 17:56
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See Vistumbler Detects Wi-Fi Hotspots, Maps Them :

Windows Vista only: Free, open-source application Vistumbler scans wireless networks within range of your Wi-Fi antenna, tracks signal strength over time, and handles pretty much everything else that other apps of this kind do. What sets Vistumbler apart from the rest is its support for GPS and live Google Earth tracking, which plots hotspots on a map.

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This app is currently free on the App Store. It seems to be more suited to mapping signals within a building rather than war-driving, but in case that's what you're looking for, check it out.

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I always liked netstumbler.

You can read about war driving here and probably get some ideas of programs that would help you.

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