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[aprssig] Position Ambituity in APRS!

Curt, WE7U archer at eskimo.com
Tue Jan 8 17:20:14 UTC 2008


On Mon, 7 Jan 2008, Steve Noskowicz wrote:

> Hmmm  I hope I didn't misunderstand this.    Disregarding the (complexities
> added by the) display at the receiving end...I understand that this can make
> things appear much different.
>      Is, or is not, position ambiguity at the transmit end simply the
> truncation of lat/lon digits?   Your explanation below implies this.

The APRS spec is of course the overriding authority here.  It
specifies truncation of lat/long least significant digits as the
means of conveying ambiguity.  Run through all the possible
combinations of missing digits for those cases to see what figure is
described on the map.

--
Curt, WE7U: <www.eskimo.com/~archer/>     XASTIR: <www.xastir.org>
  "Lotto:  A tax on people who are bad at math." -- unknown
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