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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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
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.
-15 Mobile HF station.
TNC can be hardware or software
Ui View APRSI32
Emergency services TETRA
Vehicles and boats DATATRAK