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APRS - Automatic Position Reporting System. Dennis Kidder WA6NIA 1 June 2001. What is APRS?. What started out in 1990 as a digital-equivalent of voice networks has evolved into the RF-equivalent of the Internet. Imagine being able to send a short message to anyone, anywhere, anytime.

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aprs automatic position reporting system

APRS - Automatic Position Reporting System

Dennis Kidder

WA6NIA

1 June 2001

what is aprs
What is APRS?

What started out in 1990 as a digital-equivalent of voice networks has evolved into the RF-equivalent of the Internet. Imagine being able to send a short message to anyone, anywhere, anytime.

  • Automatic Position Reporting System
    • Developed (and trademarked) by Bob Bruninga WB4APR
  • Based on AX.25
    • Unnumbered Information packets (UI)
    • UI ‘s are unacknowledged
  • VHF and HF mobile and fixed operation
  • Uses GPS (mobile) or fixed coordinates
  • Other terms:
    • Mic-E -- Mic Encoder, TNC-less encoding of location, course and speed
    • MIM - Micro Interface Module -- Telemetry TNC on a chip

APRS - Automatic Position Reporting System

more about aprs
More about APRS
  • Can be used to send simple text messages
    • May be directed to a specific address or “broadcast”
    • Text messages are acknowledged
  • Beacon can contain other information:
    • Weather station
    • Station status text, e.g., email address, QTH, etc.
  • Protocol contains encoding for displayed icon
  • Can filter on “groups”
    • use special, “designated” messages
    • limits what is displayed
  • Applications:
    • Locating stations in disaster, public service events, etc.
    • Tracking moving stations
    • Simple messaging

APRS - Automatic Position Reporting System

what is needed for aprs
What is needed for APRS?
  • Simple: just a computer with Internet connection
  • More complex:
    • Hardware
      • VHF -or- HF transceiver
        • antenna with vertical polarization
      • APRS-ready TNC -or-
      • Any APRS software-compatible TNC
      • Computer if using APRS software
      • Optional: NMEA-compatible GPS receiver
    • Software
      • Depending on radio/TNC, possibly none

-or-

      • WinAPRS -or- MacAPRS
      • APRS+
      • PocketAPRS for Palmtop computers

APRS - Automatic Position Reporting System

typical hardware
Typical Hardware

Garmin GPS units

TH-D7G

StreetPilot

MFJ Data Radio and

Kantronics KPC-3

eMap

Kenwood

GPSmap 162

TM-D700A

APRS - Automatic Position Reporting System

gps requirements
GPS requirements
  • What is NMEA?
    • National Maritime Electronics Association
    • Defines standardized protocol used by GPS receivers to send coordinates and receive waypoints
  • TNC or computer receives coordinates from GPS receiver
  • GPS map displays received stations
    • Received from TNC or computer as waypoints
    • Displays callsign of APRS station

APRS - Automatic Position Reporting System

winaprs screen shots
WinAPRS Screen Shots

APRS - Automatic Position Reporting System

aprs sa screen shots
APRS+SA Screen Shots

DeLorme Street Atlas

Display

Station List

APRS - Automatic Position Reporting System

how is aprs distributed
How is APRS distributed?
  • For small groups, just point-to-point
  • For larger areas, uses digital repeaters and routing protocols
    • Digital repeaters (digipeaters or digis) are wildcard named “RELAY” and “WIDE”
      • RELAY can talk to WIDE or to any local
      • WIDE talks to WIDE
    • Anyone can run RELAY
    • WIDEs tend to be fixed and well known.
      • VHF-HF gateways
      • Internet gateways
    • When configuring an APRS station for “packet path”
      • Use “RELAY,WIDE,WIDE” or,
      • Specific callsign of RELAY or WIDE station, if known

APRS - Automatic Position Reporting System

how is aprs distributed10
How is APRS distributed?
  • Listing of raw packets from WA6NIA-14
  • Shows position info, repetitive message (email)
  • Shows two specific WIDE digis ...K7GIL-1 and W6KRW-2
    • Also shows the generic wildcard routes: RELAY and WIDE

WA6NIA-14>APD214,RELAY*,WIDE,WIDE:=3346.12N/11806.37Wk191/000/Mic-E/M0/Off duty.. ]"42}dennis wa6nia@arrl.net

WA6NIA-14>APK101,RELAY,K7GIL-1,W6KRW-2*:@100347z3346.11N/11806.36Wk191/000/Mic-E/M0/Off duty>

WA6NIA-14>APD214,RELAY*,WIDE,WIDE:=3346.12N/11806.37Wk191/000/Mic-E/M0/Off duty.. ]"4,}

WA6NIA-14>APK101,RELAY,K7GIL-1,W6KRW-2*:@100352z3346.11N/11806.36Wk191/000/Mic-E/M0/Off duty>

WA6NIA-14>APD214,RELAY*,WIDE,WIDE:=3346.12N/11806.37Wk191/000/Mic-E/M0/Off duty.. ]"4.}dennis wa6nia@arrl.net

WA6NIA-14>APD214,RELAY*,WIDE,WIDE:=3346.11N/11806.38Wk191/000/Mic-E/M0/Off duty.. ]"4(}

APRS - Automatic Position Reporting System

where do i find aprs on the air
Where do I find APRS on the air?
  • HF
    • Typical operation is on 30 meters - 10.151 MHz (this is actually inside the band limit … uses AFSK on LSB)
  • VHF
    • National APRS freq - 144.390 MHz
    • This is a very active frequency in Southern California
  • Something new! ARISS - International Space Station
    • Uplink: 145.990
    • Downlink: 145.800
    • Route info: NOCALL

APRS - Automatic Position Reporting System

internet resources
Internet Resources
  • Information
    • http://web.usna.navy.mil/~bruninga/aprs.html
    • http://www.aprs.net
    • http://aprs.rutgers.edu
    • http://aprs.org
  • APRS servers on the ‘net
    • www.aprs.net and mirrors
      • connects with Telnet from WinAPRS or APRS+
      • Provides real-time, world-wide display
    • www.findu.com
      • Can be accessed by anyone
      • example: http://map.findu.com/wa6nia-14
  • Software sources
    • TAPR: http://www.tapr.org
      • WinAPRS
      • APRS+
    • PocketAPRS http://www.pocketaprs.com

APRS - Automatic Position Reporting System

demo configuration
Demo Configuration
  • In the conference room
    • Kenwood TH-D-7G (WA6NIA-1)
      • Dual-band (VHF/UHF) data radio with built-in APRS-capable TNC
      • Garmin eMap GPS receiver with interconnecting cable
    • Notebook with WinAPRS
    • Palm III with PocketAPRS
  • In the parking lot:
    • Kenwood TM-D700A (WA6NIA-14)
    • Garmin Street Pilot GPS with interconnecting cable
      • (No waypoint display … NMEA out only)

APRS - Automatic Position Reporting System

slide14
Demo
  • WA6NIA-14:
    • beacons on five minute intervals
    • parked in FU parking lot
  • WA6NIA-1
    • should display WA6NIA-14 and possibly others
      • stations displayed depends on nearby RELAY or WIDE digi

APRS - Automatic Position Reporting System