The WiGLE project accepts native .ns1 NetStumbler files (along with many other types: Kismet, DStumbler, MacStumbler, Pocket Warrior). The JiGLE client can load them locally. You can also submit to the website, it gets added to our database (over 580,000 so far), and the JiGLE (java), DiGLE (windows), or TinGLE (mac) clients can display the points on our self-rendered maps. There's also a web-based mapping as well.
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