[aprssig] APRS SPEC: Wind Speed confusion

Bob Harris knineudx at gmail.com
Fri Oct 14 10:52:05 CDT 2016

If you decide to amend the APRS spec to standardize on a wind speed 
measurement,/please, please/, update the specification and not just put 
the changes on your web pages so people have to wade through stuff that 
includes your thoughts, plans, dreams, and experiments.

While you're at it, update the spec with the rest of the changes that 
have been promulgated since it was written so everything is in one place.

Thank you.

On 10/14/2016 10:47 AM, Robert Bruninga wrote:
> The APRS spec is confusing and uses WIND SPEED in Knots in some places 
> and in MPH in others.  This has been with us from the beginning.  But 
> with more and more code being put into hardware and not easily 
> upgraded software, should we fix this?
> I think many existing radios and clients just decode them all as if 
> they were MPH anyway (metric countries convert MPH to KPH, or do they 
> convert KTS to KPH?)
> * Raw Weather Report
> * Positionless Weather Report ( ccccssssggggttttrrrrppppPPPPhhhbbbbbb )
> * Complete Weather Report ( DIR/SPDggggtttttrrrrppppPPPPhhhbbbbbb )
> * Storm Data (DIR/SPD/ST/www^GGG/ppp>RRR&rrr%ggg
> ssss = sustained one-minute wind speed (in mph).
> gggg = gust (peak wind speed in mph in the last 5 minutes).
> SPD = the speed is expressed in knots.
> www = Sustained wind in knots
> GGG = Gust wind in knots
> Should we change it to all MPH to get rid of this potential for 
> confusion, or will we just create more?
> Bob, WB4APR
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"The world of goodness is filled with fleas."

Bob Harris
Can MOTCH Katmai Henry David Thoreau UDX Bda UD (1992-2005)
Longmeadow Bradford Torrey CD (2001-2014)
Ch Silvercreek Gossip Girl
Bath, NH
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