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[aprssig] Wi-Fi Positioning System (WPS) for APRS

Brady bradysmall at bellsouth.net
Wed Sep 6 03:08:11 UTC 2006

Netstumbler will listen to a GPS and has scripts (have to search the web for
them) that will use Microsoft Mappoint and plot all the points on a map as
you drive.. As you get closer to a access point, it will move the point on
the map to the location where the signal gets higher, pinpointing its
location. Save the map in mappoint and you got a whole map of access points.


-----Original Message-----
From: aprssig-bounces at lists.tapr.org [mailto:aprssig-bounces at lists.tapr.org]
On Behalf Of John Habbinga
Sent: Tuesday, September 05, 2006 1:31 PM
To: TAPR APRS Mailing List
Subject: Re: [aprssig] Wi-Fi Positioning System (WPS) for APRS

Netstumbler tells you were the Wi-Fi access points are at.  WPS tells you
where you are at based on signals from Wi-Fi access points.

WPS doesn't care what the SSID is.  It detects Wi-Fi systems regardless of
if they are broadcasting their SSID and records the MAC address, which
rarely changes.

Yes, Wi-Fi is changing and will require the area to be redriven at a later

I rarely ever, am unable to detect a Wi-Fi signal with the scanning device
that I'm using.

On 9/5/06, David Huff <davidh at cf.distek.com> wrote:
> Have you looked at netstumbler? www.netstumbler.com  It has support 
> for reading GPS positions (it reads NMEA GPS data)  There are also 
> similar wifi mapping applications out there.
> I have heard of companies trying to do this, one article I read said 
> they always seem to run into 2 problems.
> 1. Some Wifi systems change their SSID,(usually advanced configs, or 
> an easy way to allow changing security profiles) And mapping Wifi is a 
> changing thing, people are continually turning off changing or buying 
> new wifi equipment.
> 2. The Wifi connection cloud can be huge in some cases, the largest 
> wifi node can easily span a city block or more.

John Habbinga, KC5ZRQ
Lubbock, Texas

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