APRS: Automatic Position Reporting System
APRS is a system developed by Bob Bruninga, WB4APR, which uses
amateur radio to
transmit position reports, weather reports, and messages between users.
My contribution is the internet portion of the system. Although ham radio is
capable of digital long distance communications, it tends to be slow and unreliable,
especially when compared to the internet. I've written software to take the
data received locally and make it available via the internet, to be displayed
with a Java applet.
What you are looking at here is a number of position reports from amateur
radio operators in South Florida. At times you may see vehicles, planes, or boats moving
around town. These vehicles obtain their location using the satellite system known
and transmit that position for others to follow. There are also a few
weather stations visible on the map. Click on one of these to see their current
You can select different maps from the menu at the bottom of the applet,
zoom in and out, and scroll with different keys. See the list below for details.
For more info on APRS, check out the
APRS Virtual Meeting.
For information about how to get started in APRS,
try this link.
You can see a
replay of the 1998 Dayton Hamvention activity here.
(Be patient...the applet, map and data files are over 200k, so depending
on your connection speed it may take a couple of minutes to load.)
javAPRS Commands (Case Insensitive)
|U or PGUP ||zooms up (wider view)
|D or PGDN ||zooms down (narrower view)
|L ||lists stations heard to the Java console
|W ||lists only weather station reports to the Java console
|B ||lists beacons to the Java console
|I ||lists ID reports to the Java console
|M ||lists last 25 messages to the Java console
|CTRL-click ||centers map on clicked location
|ALT-click ||zooms in on clicked location
|Arrow keys ||scrolls map
Clicking on a station shows its information in the status bar
For a page that starts with a USA map, and doesn't have the introductory test,
javAPRS written by Steve Dimse, K4HG.
Mail comments to firstname.lastname@example.org
Steve's home page
Steve's javAPRS page.
Want to add javAPRS to your web pages? Here's how.
APRS is a registered trademark of APRS Software and Bob Bruninga, WB4APR.