The website says support for Linux devices is "Coming Soon".

It seems to me that this can only work it the various hotspots participate by supplying their location to SkyHook. That's fine for Starbucks, McDonalds, etc. but more often than not the AP in range belongs to a private individual or business, and is susceptible to being moved, renamed, etc.
Beside that, I don't think I want SkyHook or anybody else tracking where I am all the time, and sending me "targeted" SPAM.
It's bad enough the cell phones are headed that way without volunteering another device, IMHO

Walt