[aprssig] APRS SPEC: Wind Speed confusion

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Fri Oct 14 15:13:53 CDT 2016


APRSISCE/32 reports course/speed with the extension and doesn't do Mic-E.

APRSISCE/32 also decodes everything according to the specs that were in 
place when it was authored.  Yes, there are different units in different 
places, but they are decoded appropriately assuming that the originators 
followed the spec as well.

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

On 10/14/2016 12:06 PM, Andrew Pavlin wrote:
> Who's using the Course and Speed extension? Anyone reporting the 
> position of a mobile station without using Mic-E, and anyone reporting 
> the position of a moving Object/Item. Both of those cases would 
> probably include the course and speed to get more accurate 
> dead-reckoning of the moving station/object's position between reports.
>
> Now, which stations actually do that is another story. Very few 
> Objects/Items are moving targets, and most mobiles use the Mic-E 
> format. Is my YAAC software the only one that gives the option of 
> reporting mobiles with that extension?
>
> Andrew, KA2DDO
> author of YAAC
>
>
> ------------------------------------------------------------------------
> *From:* Kenneth Finnegan <kennethfinnegan2007 at gmail.com>
> *To:* Greg Trasuk <trasukg at trasuk.com>
> *Cc:* TAPR APRS Mailing List <aprssig at tapr.org>
> *Sent:* Friday, October 14, 2016 11:46 AM
> *Subject:* Re: [aprssig] APRS SPEC: Wind Speed confusion
>
> On Fri, Oct 14, 2016 at 8:33 AM, Greg Trasuk <trasukg at trasuk.com 
> <mailto:trasukg at trasuk.com>> wrote:
>
>     Unless there’s a compelling reason otherwise, I’d standardize on
>     knots,
>
>
> I'd say the compelling reason is that the weather data packet format 
> on page 64 of APRS 1.0.1 says mph, so it's likely that the majority of 
> implementations working off the spec already use mph.
>
> Knots is currently used for the Wind Direction and Wind Speed data 
> extension and the storm data report. I think the distinction of where 
> we use MPH vs Knots is pretty clear, but accepting Bob's premise:
> * We can't change the Wind Direction/Speed extension to mph since it's 
> indistinguishable from the Course and Speed extension. Where is this 
> extension even used? I'd vote for deprecating it.
> * I'd be ok changing the Storm Data report to MPH, but I live in 
> California so my indifference is high on this one.
>
> --
> Kenneth Finnegan
> http://blog.thelifeofkenneth.com/
>
>
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