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[aprssig] The best resolution of position from APRS

Andrew Rich vk4tec at tech-software.net
Tue Jan 3 19:48:47 UTC 2006


I am not sure how the discussion on position accuracy turned into kenwood
wars but anyway.

Would it not make sense that THE best accuracy would be obtained by sending
the RAW GPRMC string in its entirity ?

What I was trying to say was that UI-View however it sends, only lets you
INPUT your location in a position limited format.

I will write something in perl , and move my house around and see what I can
get out of google earth.

-----------------------------------------
Andrew Rich - VK4TEC
vk4tec at tech-software.net <mailto:vk4tec at tech-software.net>
www.tech-software.net
Brisbane AUSTRALIA



-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Robbie - WA9INF
Sent: Wednesday, 4 January 2006 4:40 AM
To: Curt Mills, WE7U; TAPR APRS Mailing List
Subject: Re: [aprssig] The best resolution of position from APRS


Curt and the group,

Copying from the Help File of UI-View32;

Compressed - If this option is checked, then your position is
transmitted in APRS compressed format. Please note that some software
can't decode compressed format, and also it makes your beacons
completely meaningless to any casual observer using a simple terminal
program, so use this option with caution.

I wonder if Roger used Base-91 Compressed format?

So far, I find no further information yet... I assume if he programmed
it to be sent, it would receive it, :-)

Robbie

Curt, WE7U wrote:
> On Tue, 3 Jan 2006, Andrew Rich wrote:
>
>
>>I have been playing with UI-VIEW and I notice I can not get my position
>>quite on for APRS.
>>
>>I think I am seeing the limitation to the co-ordinate system being used.
>>
>>Which begs me to ask. What is the best resolution and how from the APRS
Spec
>
>
> Base-91 Compressed format.  Chapter 9 of the published spec.  Gives
> you something like 1-2 feet resolution (about 1/3 to 2/3 of a
> meter).  Not all APRS applications support it though.
>
> --
> Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
> "Lotto:    A tax on people who are bad at math." -- unknown
> "Windows:  Microsoft's tax on computer illiterates." -- WE7U
> "The world DOES revolve around me:  I picked the coordinate system!"
>
> _______________________________________________
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> aprssig at lists.tapr.org
> https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
>
>



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