Links:
Reporting APRS & AIS stations in area showing tracks for past hour.
Move mouse cursor over map area, and click on any icon for more information.
APRS.FI Internet APRS Maps(Real-time APRS tracking the easy way!)
APRS Information
Sable 3 APRS Balloon Experiment
Balloon Experiments with Amateur Radio
Amateur Radio High Altitude Ballooning
W0RPK Amateur Radio Above & Beyond
HATT Calculator
PHGR Calculator
VA3ROM APRS Wx Station
FindU.com
APRS World
APRS Software
Citizen Weather Observing Program
Canadian (Ham) Amateur Radio Online Course
