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Automatic Position Reporting System. What is APRS all about? (Humans communicating INFO with Humans). Immediate local digital and graphical information exchange between all participants in a local area or event. This includes: Positions of all stations and objects Status of all stations

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what is aprs all about humans communicating info with humans
What is APRS all about?(Humans communicating INFO with Humans)

Immediate local digital and graphical information exchange between all participants in a local area or event. This includes:

Positions of all stations and objects

Status of all stations

Messages, Bulletins and Announcements

Weather data and telemetry

DF bearings and signal strengths for quick transmitter hunting

RF Connectivity plots of all stations

Local OBJECTS on a common map display for all users

Local Freqs, IRLP, ECHOlink, Winlink, Nets, Meetings

Typical applications are:

Routine local awareness of all ham radio events and assets around you

Marathons, races, events and public service

Search and rescue

Family communications and tracking and one-line emails

Mobile-to-mobile global text messaging

Weather data exchange and display

Efficient multi-user Satellite communications


APRS was developed by Bob Bruninga, WB4APR, as a real-time local tactical communications system for rapidly exchanging digital data of immediate value to operations. This really took off when GPS became available and MAPS were integrated into the system for tactical situational awareness of everything in the net. In the 18 years since its introduction, (see history) it has grown to encompass just about every aspect of Amateur Radio.


height of about 11,500 miles

travelling at 9,000mph

signal frequency (1575.42 MHz)

The distance to the GPS satellites can be determined by estimating the amount of time it

takes for their signals to reach the receiver. When the receiver estimates the distance to

at least four GPS satellites, it can calculate its position in three dimensions.


APRS is a real-time tactical digital communications protocol for exchanging

information between a large number of stations covering a large (local) area

As a multi-user data network, it is quite different from conventional packet radio


ssid call sign what you are
SSID (call sign +what you are)

0 Home Station, Home Station running IGate.

-1 Digipeater, Home Station running a Fill-In Digi, Wx Digipeater

-2 Digipeater [#2 or] on 70CM

-3 Digipeater [#3]

-4 HF to VHF Gateway

-5 IGate (Not home station)

-6 SatGates & Special function Station.

-7 Kenwood D7 HH

-8 Secondary Mobile station.

-9 Primary Mobile station.

-12 Portable Units such as Laptops etc.

-14 Trucks

-15 Mobile HF station.

sound modem
Sound Modem

TNC can be hardware or software


Ui View APRSI32

who else uses it
Who else uses it


Emergency services TETRA

Shipping SPRS

Vehicles and boats DATATRAK

amateur uses
Amateur Uses

Olympic flame



Propagation studies