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[aprssig] barometric pressure units

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Mon Nov 5 02:31:53 UTC 2012


Do you have any examples of stations doing it in the different units?  
Have you determined the source of their data?

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 11/4/2012 9:21 PM, Andrew P. wrote:
> Greetings, all.
>
> There seems to be a discrepancy between the APRS protocol 
> specifications and what stations are actually sending regarding 
> barometric pressure values. The APRS 1.0.1 specification says on pages 
> 64 and 67 that pressure should be reported in tenths of hectopascals 
> (or tens of pascals), but most stations (at least in my area) seem to 
> be transmitting pressure in pascals. But there are other stations 
> transmitting other units (what units could a pressure of 8272 be?).
>
> Is this a bug, or a change in the specification that I haven't found 
> in the newer revisions of the protocol specification?
>
> Andrew Pavlin, KA2DDO
>
>
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