Automatic Position Reporting System
APRS allows users to view where other stations are in relation to them, commonly on a map. Though APRS is not limited to position data, position data is used most.
Practical applications for this mode might include Skywarn storm spotting operations allow net control operators to look at a screen and see where a spotter is instead of calling the spotter on what could be a very busy net. All of this happens very quickly -- many times under two minutes.
I have for your enjoyment, listed the position of my stations.
K0SKW - 
Lat: 41.244167 Lon: -96.010833
Reported: 2010-03-08 04:01:27
K0SKW-10 -
Lat: 41.244167 Lon: -96.010833
Reported: 2009-04-26 21:45:33
K0SKW-2 - 
Lat: 41.244167 Lon: -96.010833
Reported: 2009-11-23 02:11:51
K0SKW-3 - 
Lat: 41.243833 Lon: -96.010833
Reported: 2007-02-19 03:29:00
K0SKW-9 - 
Lat: 41.243833 Lon: -96.011333
Reported: 2010-03-08 23:27:43
Google Map
I have placed my stations on a Google Map so that you may all see where I am in... relation to... myself! Be advised, Google Maps aren't *completely* accurate in this application, especially when it comes to satellite images. If it looks like my car (K0SKW-9) is in someone's house, chances are, it isn't. But, it could be in someone's house...