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Idea: GPS sorta based off Access Points Answered

Ok, here is what ive been wanting to create for awhile now and i know ill never have the smartness to build it myself so i thought it throw it out to the crowd Basically ive had in mind is a GPS program that works on any WifI device (laptop or WiFi mobile phone) and it use's triangulation from the signal strengths of three Access Points to tell you where you are at the moment The reason for this is is that at my Uni, i always see people getting lost because its so massive! and some people just can't read maps ( funny, i know) So if there was a program that used Access Points (there thousands of those in my uni) to pin point where you are Some basic Questions i guess - Which programming laungage? (Java?) - Can signal strength be broken down into small categories rather than Excellent, Very Good, Good, Poor - from that, would each Access Point have its own meters per unit estimate? This is probably silly of me to post this here because now someone else can create it (or if they have, someone link me haha) and call it their own :S Cheers Oily



Netstumbler is a software with this capability its really cool

This is already being done, just read engadget.com, theres always a thing once in a while about someone coding a program for that use. I came across one that works on a mobile phone or pocket pc that has either wifi, gprs (normal cell data), or a combination of the both and it triangulates from one or the other or both if avalible. Sorry I can't remember what it is but I'll look it up later and post you a link, theres a java file that you can download (and if you have skill) upload it to your phone or more easily on a pocket pc as they don't have to be unlocked and accessed through a programmer to install programs/games.

damn it ahhaah thats cool, cheers for the heads up guess i can start thinking of a new idea

. As others have mentioned, there are difficulties to overcome, but it should be possible, if not feasible. There should be enough APs in stable positions (or don't change very often) that you could triangulate using a directional antenna and a lookup table. . In a campus environment, I don't think you will be able to rely on signal strength to tell you much (but I could be wrong). . Making it simple enough for someone who can't read a map is likely to be a real challenge. ;)

Yeah ill i used a program called Network Stumbler to see what AP are in range when i was sitting class and i picked about 5 and three where excellent signal but yeah, i just put this idea out there because its not really going anywhere in my head at the moment

The mobile phone carriers can do a simmilar thing. they can give an approximate location of a phone using signal strength received by nearby towers. The difference is the mobile phone towers are in fixed and known locations. They are looking at it from the other side, three towers receiving signals from one transmitter, rather than one receiver and three tansmitters.

Your problem is that access points don't know their own location. Without some sort of location information, triangulation couldn't be calculated. And yes... The signal strength is calculated in decibels. It's your computer that translates that into english.