[aprssig] The best resolution of position from APRS

Curt, WE7U archer at eskimo.com
Tue Jan 3 10:58:11 EST 2006

On Tue, 3 Jan 2006 scott at opentrac.org wrote:

> > 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.
> I think it's equally likely that the position error is due to map
> registration or datum errors.  UI-View does NOT have the greatest map
> support - in fact, I'm pretty sure it doesn't have any concept of
> projection.  Or is it smarter than it looks?

I don't think any of the APRS applications have much of a concept of
projection, so it's not quite fair picking on UI-View in this
context.  Xastir has the possibility of doing some nice things with
projection, but currently doesn't do much with it.

Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
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