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Re: Time for Serious GPS Application

From: Jeff King <>
Date: Thu, 11 Jan 2001 15:48:09 -0500

Norm:

Better late then never I guess...   (sorry)

brainboy wrote on 12/28/00:

> I might have missed this in the previous post(s), sorry.  But tell me if
> this is right.
> 
> findu.com is getting location/other???(weather) updates via some TCP/IP
> port.

Yes, it receives it via the streaming telnet application, to see the
raw data telnet to aprs.net

> It all is stuffed in DB (mySQL) and then queried via the various cgi URLs
> shown on findu.com.

Yes

> You just fandangled the system by telneting to the port and hand entering
> data.

Fandangled might be a strong word..;-) made my best guess as to the positions.

> Is there a spec or client software for the protocol I did not find much at
> findu.com? Is it the APRS spec?  I'm finding lots of software and sites
> showing maps but little with tech info. Got any pointers?

No, not to much. Had to reverse engineer alot of it. Now, I do have the
source code snippet to the passcode algorithm. Here are some links:

http://www.aprs.net/inetmsg.html
http://www.aprs.net/valid.html

> Is APRS the radio->TCP/IP gateway? or is the displaying/passing of this info
> over the Internet something different?

APRS is just a name. The actually "gateways" are client applications run by
ham radio operators. Typically they will have the computer hooked to the internet
and a packet radio modem (TNC) hooked to the radio. With a typical antenna that
will give them a 10-20 mile radius and quite a bit farther if they use digipeaters
(store and forward bit repeaters).

> what findu is all about?

the aprs.net data stream is real time..... findu is just a archiving tool...
(both good and bad points about this). 

> thanks for the info,

Sure, sorry it took so long, was just cleaning up the inbox and I see I missed
a few of these.

-Jeff

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