[aprssig] APRS Object & Weather format

Nick VA3NNW tapr at noseynick.com
Sun Oct 24 18:00:14 EDT 2021

Andrew AB9FX wrote:
> I think, a little detail is missing in the packet without position – 
> that’s temperature. There is a need in the APRS standard to have a 
> temperature field, at least t…
APRS101 P63 "Positionless weather report [...] The weather report must 
include at least the MDHM date/timestamp, wind direction, wind speed, 
gust and temperature, but [...] Where an item of weather data is unknown 
or irrelevant, its value may be expressed as a series of dots or spaces. 
For example, if there is no wind speed/direction/gust sensor, the wind 
values could be expressed as [...]"


Alternatively, especially if you don't know the TIME EITHER, you could 
(ab)use position ambiguity - transmit a deliberately vague position - 
implemented by replacing low-order lat/long digits with spaces:

!49  .  N/072  .  W_.../...g...t077 or even...
!    .  N/     .  W_.../...g...t077


"Nosey" Nick Waterman, VA3NNW/G7RZQ, K2 #5209, IRLP #2410
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