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Re: Time for Serious GPS Application

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

Doug:

Sorry for the late reply

Doug Sutherland wrote on 12/28/00:

> 1) Do you know how much precision is attainable?

I believe the actual "APRS spec" gives you either 60 feet or
6 feet depending on what protocol you use.

>     This plot
>    places me in the town of los gatos, and is something
>    like seven miles off.

Well, that was me. I just found the mention of Los Gatos on
my map and plopped you their. Actually was kinda hoping I didn't
get to close to you so the cruise missiles wouldn't cause much
damage  ;-)

>    Do you know if the
>    findu system accepts fractional coords (37.xxxx) or
>    degree/minutes, and to what precision?

I think at this point it is just supporting 4 decimal places,
not sure off-hand how close that will get you. Remember though,
FINDU is the off-line database, the stream is at aprs.net and
that will support whatever you hand it (and then can parse out).
Supposedly, FINDU is going to be made open source, I'm sure he
would consider early release of it to someone that could help
out.

> 2) You entered "doug" instead of the normal amateur radio
>    license identifier. Is that permanently stored in the
>    APRS system or does it need to be specified for each
>    query to the system?

Hmmm.....  see it is now gone. I thought it was supposed to be
permanent but maybe it eventually falls off the queue. 

> 3) The amateur radio license identfiers are already unique
>    since they are broken down by a country identifier plus
>    region identifier plus unique indentifier for each
>    person in the area. How would be guarantee uniqueness
>    for people if don't have these identifiers?

No real value here, first of all, the region callsigns can cover
multiple states, and if you move, you can carry the same call.
(I could use my Michigan call in California). 

>Or does it even matter?

The one thing you hit upon is the identifiers need to be unique....
no checking for that now.

But my mention of APRS was more food for thought.... 

Regards,

Jeff

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