APRS

APRS. Use 144.390MHz.

Sites

• https://aprs.fi/%7Caprs.fi
• https://aprs.link/app/aprs - APRS.LINK (by DB0ANF)
• http://findu.com/
• http://aprs.mountainlake.k12.mn.us/ - APRS propagation map

Useful things

APRS queries

• See SA7SKY's PDF of APRS services here (local copy File:APRS-Queries.pdf here)

?APRS?

Send ?APRS? to a station to get a list of the queries the station supports.

?WX?

Send ?WX? to CQ to get a list of all WX stations within your range.

Others

• ?ABOUT (?APRSV, ?VER) - get the station's software version, etc.
• ?APRSD - get a list of stations the station has heard directly.
• ?APRSH - get a statistic on stations the station has heard, including via digipeaters, the internet, etc.
• ?APRSH callsign - query if the station has heard callsign.
• ?APRSL - get a list of stations the station has heard locally in the last 30 minutes.
• ?APRSM - check if the station has any messages for you.
• ?APRSO - prompt station to send out all objects it is originating.
• ?APRSP - prompt station to send out a position beacon.
• ?APRSS' - get the station to return its status.
• ?APRST (?PING?) - get the station to return the track a packet takes.

APRS services

WHO-IS

Look up a callsign by sending it to WHO-IS. For example, sending VE7CXZ results in VE7CXZ/A/Andy Smith/BC/Canada.

SMSGTE

Send a text to a North American cellphone by sending a message to SMSGTE. To send 'Hello!' to 250 813 2494, send the message @2508132494 Hello! to SMSGTE.

METAR

Get the weather for a METAR code by sending a message to METAR.

QRU

Get nearby objects by sending messages to QRU. Sending INFO 250 will return a summary of all objects within a 250km radius.days

• APRS:Frequencies