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APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved APRS-IS APRS and the Internet.

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Presentation on theme: "APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved APRS-IS APRS and the Internet."— Presentation transcript:

1 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved APRS-IS APRS and the Internet

2 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved APRS Tactical UI protocol Everyone sees everything within range Messaging capable AX.25 based

3 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Why the Internet? Desire to see more than local RF Utilize facilities available only on the Internet Low cost backbone between RF networks World-wide availability

4 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Current APRS-IS Design

5 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Core Servers first.aprs.net, second.aprs.net, third.aprs.net, fourth.aprs.net All packets pass through core Offer full feed ports and message-only ports Some offer filtered ports

6 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Tier 2 Servers aprs2.net Full feed ports Regional ports User-defined filter ports Specialty ports (CWOP and Satgate ports)

7 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Other Servers Normally provide “local” access Run independently (not as a group) Various levels of reliability and capabilities

8 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Where do I connect? Servers connect to first through fourth.aprs.net port 23 or IGates should, at a minimum connect to reduced feed ports on the core or tier 2 servers. Clients should connect to tier 2 server filtered feeds.

9 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved javAPRSFilter Server adjunct to javAPRSSrvr Any connection to reduced-feed ports can invoke filters Server can have predefined filters on ports Filters are additive With a browser, go to for port availablility

10 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved fourth.aprs.net Core server in College Station, TX Supports all core ports –23, – Full Feed –1314 – Message-only – – IGate Port Supports specialty ports 1– javAPRSSrvr only

11 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved IGates Pass all packets heard on RF to an Internet server (certain limitations) Pass messages addressed to local RF stations from APRS-IS (certain limitations) Pass sysop designated packets from APRS-IS to RF

12 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Why Gate? APRS on same 2 meter frequency nationwide 1200 bps, about 400 bps effective throughput APRS-IS currently about 10,000 bps APRS is tactical (local area) IGates provide world-wide connectivity

13 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Should I IGate? Bidirectional vs. Unidirectional Unidirectional – Anyone with Internet access Bidirectional – Areas not covered by other IGates DFW has 3 24/7 IGates plus 3 more part-time Duplicate coverage causes collisions & congestion

14 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Extra Internet Features World-wide messaging Callsign Lookup Web page tracking Tracking overlaying NWS radar maps

15 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved World-Wide Messaging Message gated from RF to APRS-IS IGate has seen TOCALL recently IGate gates message to RF Ad infinitum

16 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Message to or an APRS+SA IGate format: message text APRS+SA format: message text Message must be short One-way (to Internet)

17 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Callsign Lookup Message to APRS+SA IGate Format: –w:mycall –l:mycall W(hois) provides 1 line response from QRZ L(ocation) provides 3 line response from QRZ

18 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Internet Capable Clients APRS+SA APRSPoint javAPRS MacAPRS/WinAPRS/X-APRS UI-View Xastir

19 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved javAPRS ANY web site can be a LIVE APRS display Works with any browser supporting Java applets Supports server filtered feeds Supports Dosmaps and map images Free –

20 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Web Page Tracking Other sites

21 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved NWS Radar Overlays Static Display – Real-time Display –

22 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved NWS Radar Display

23 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved q Construct Used for loop detection and other diagnostics Implemented in latest javAPRSSrvr and aprsd servers Construct for Internet only, not RF

24 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Interesting Facts on APRS-IS Over 2700 validated servers, clients, and IGates Over 2000 non-validated clients Over 20,000 RF stations Over 900 CWOP weather stations Over 14,000 Objects and Items (Data from 10 day period during May 2004)

25 APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved Q&A Peter Loveall AE5PL


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