APRS has been an important aspect of Amateur Radio for about a decade, give or take a few years. It replaced Packet (old-school Packet) as the de-facto digital data standard on terrestrial VHF. It is an efficient way of transmitting small amounts of data, such as a relatively precise map coordinate, temperature, weather bulletins, or even greetings and short QSOs through satellites. But, one aspect of APRS confused me at first, and I'm sure that other may have this same question: What do the AP codes mean?
When an APRS packet is transmitted, it is preceded by a 4-6 character signature, normally beginning with AP. These are APRS "TO CALLS". This is the preamble to the APRS network that the information to follow is meant for it. Whether it comes to your station terrestrially or via satellite, is interesting to see what software others are using...based simply on the TO CALL they use.
The following list makes it easy to determine what is being used:
APn: 3rd digit is a number
AP1WWX TAPR T-238+ WX station
AP4Rxy APRS4R software interface
APnnnD Painter Engineering uSmartDigi D-Gate DSTAR Gateway
APnnnU Painter Engineering uSmartDigi Digipeater
APA: APBxxx Beacons or Rabbit TCPIP micros?
APBLO Model Rocketry K7RKT
APC: APCLxx Cellular applications
APCLEZ Telit EZ10 GSM application ZS6CEY
APCYxx Cybiko applications
APD: APRSd, etc
APDTxx APRStouch Tone (DTMF)
APDFxx Automatic DF units
APDPRS D-Star originated posits
APE: PExxx Telemetry devices
APERXQ Experimental tracker by PE1RXQ
APF: APFxxx Firenet
APFGxx Flood Gage (KP4DJT)
APG: Gates, etc
APH: HamHud, etc
API: Icom, etc
APICQx for ICQ
APJ: APJAxx JavAPRS
APJExx JeAPRS
APJIxx jAPRSIgate
APJSxx javAPRSSrvr
APK: APK0xx Kenwood THD7's
APK1xx Kenwood D700's
APL: Linux applications
APM: MacAPRS, etc
APN: Network nodes, digis, etc
APN3xx Kantronics KPC-3 rom versions
APN9xx Kantronics KPC-9612 Roms
APNAxx WB6ZSU's APRServe
APNDxx DIGI_NED
APNMxx MJF TNC roms
APNPxx Paccom TNC roms
APNTxx SV2AGW's TNT tnc as a digi
APNUxx UIdigi
APNXxx TNC-X (K6DBG)
APNK01 Kenwood D700 (APK101) type
APO: APRSpoint
APOTxx Open Track
APOD1w Open Track with 1 wire WX
APOU2k Open Track for Ultimeter
APP: PocketAPRS, etc
APQ: APQxxx Earthquake data
APR: APR8xx APRSdos versions 800+
APRDxx APRSdata, APRSdr
APRKxx APRStk
APRS Generic, (obsolete. Digis should use APNxxx instead)
APRXxx APRSmax
APRTLM used in MIM's and Mic-lites, etc
APRtfc APRStraffic
APRSTx APRStt (Touch tone)
APS: APRS+SA, etc
APT: APTIGR TigerTrack
APTTxx Tiny Track
APT2xx Tiny Track II
APT3xx Tiny Track III
APTAxx K4ATM's tiny track
APTWxx Byons WXTrac
APTVxx for ATV/APRN and SSTV applications
APU: APU1xx UIview 16 bit applications
APU2xx UIview 32 bit apps
APU3xx UIview terminal program
APV: Voice over Internet applications
APVRxx for IRLP
APVLxx for I-LINK
APVExx for ECHO link
APW: APWxxx WinAPRS, etc
APWSxx DF4IAN's WS2300 WX station
APX: APXnnn Xastir
APXRnn Xrouter
APY: Yaesu?, etc
APZ: Experimental
APZ0xx Xastir (old versions. See APX)
APZPAD Smart Palm
APZWIT MAP27 radio (Mountain Rescue) EI7IG
Other TOCALL's that APRS recognizes and processes are:
ALL,
BEACON,
CQ,
QST,
GPSxxx,
APxxxx.
So, when you see APU25N (possibly the most popular TO CALL), you know right away that it's the 32-Bit (Windows 95 and above) version of UI-View.
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