Automatic Position Reporting System / Automatic Packet Reporting System

Used by permission of Bob Bruninga — WB4APR.  Thanks Bob for your permission and suggestions.

Definition: A packet radio application for tracking real-time events by graphically displaying information on maps displayed on the user’s computer screen.

Software Available for APRS

APRSDos                                         DOS

MacAPRS                                         Macintosh

WinAPRS                                         Windows


paImAPRS                                       uses Palm III Organizer

XAPRS                                               Linux

Xastir                                                 Linux

Windows CE

UI — View

APRS Plus (APRS+)              uses DeLorme Street Atlas for maps

Software available for download from: www.tapr.org click on “Latest APRS Software”

Go to “Software” and download software of your choice.

APRSDos can run on an old computer that has 8088 processors and as little RAM as 640 Kb.

 Publications available on APRS:

Getting On Track with APRS; ARRL Publication, 1996

APRS Tracks, Maps and Mobiles; ARRL Publication, 1999

Frequencies in Use:

2 meters         144.39          USA/Canada/Most of Europe

145.825        PCsat APRS satellite at 1200 baud up and down

Space Station   145.800 downlink

(ISS)        145.990 uplink

70 cm             445.925


30 meters      10.151 LSB most commonly used

20 meters      14.103 LSB

17 meters      18.107 LSB

A GPS Receiver is not required and does not have to be hooked up for a home(QTH) or a fixed station, all that is required is your known position (Latitude/Longitude) which can be found on DeLorme Street Atlas, DeLorme Topo State maps, any USGS Topo map, or by someone with a GPS receiver!

Internet Sites:
WB4APR http://www.ew.usna.edu/bruninga/aprs.html
Northwest APRS http://nwaprs.org
Kansas City APRS http://www.kcaprs.org
Northern Illinois APRS http://nian.aprs.net

Internet Sites Regarding the PCsat APRS satellite:

PCsat WEB  page http://www.ew.usna.edu/~bruninga/pcsat.html
ISS-APRS FAQ http://www.ew.usna.edu/~bruninga/iss-faq.html
APRS LIVE pages http://www.ew.usna.edu/~bruninga/aprs.html
APRS SATELLITES http://www.ew.usna.edu/~bruninga/astars.html

Live APRS activity on the Internet


This is live APRS activity in North America or you can specify a Region you wish to view, this takes awhile to load so be patient.



This site gives you 3 views of a stations location and a few other options. Remember to end this url with the station you want to view callsign. i.e.http://www.findu.com/cgi-bin/find.cgi?KI0BJ

New Hardware for APRS

Kenwood TH-D7A  2m/440 MHz handheld radio with built-in 1200/9600 tnc, built-in APRS software, can send messages and view other APRS stations. 
Kenwood TM-D7OOA 2m/440 MHz mobile radio with built-in 1200/9600 tnc, built-in APRS software, built-in 9pin D connector to connect to computer.

APRS Stations in Montana, Northern Wyoming

KI0BJ Yellowtail, MT (Ft Smith) Gateway, Trackers, Portable Station
K7MT Helena, MT I-Gate, Trackers, Digi, Portable Station
AC7DE Helena, MT Fixed Station
KC7VCY Helena, MT Fixed Station
BZNLAN Bozeman, MT Fixed Station at High Flats
KD7MFJ- 11 Bozeman, MT High Altitude Balloon — MSU Physics Dept.
N7VMR-1O Billings, MT Digi
N7VMR- 1 Billings, MT I-Gate
K7ETT Billings, MT Fixed Station
K7LEW Billings, MT Fixed Station
KC7QBR Billings, MT Tracker
N8BMA Sheridan, WY I-Gate, Trackers
KC7ZRU Casper, WY I-Gate, Tracker

We are always looking for future Digipeater sites.  If you know of a good site and the name, email address & telephone number of a contact person, please let us know.

If you have questions about APRS or how to set up an APRS station we can be reached at the following e-mail addresses:

KIOBJ      Rex Blaine        email: jblaine@nemontel.net

K7MT       Bill Erhardt   email:       erhardt@mt.net

Hope to see you on APRS soon!