[aprssig] APRS Object & Weather format

John Gorkos jgorkos at gmail.com
Sat Oct 23 16:10:39 EDT 2021

APRS Spec 1.01: 29 AUG 2000, bottom of page 65 (curse the editor that 
didn't put Table #s), "Complete Weather Format -- With Lat/Long 
position, No Timestamp" indicates that it should be valid.  HOWEVER, on 
the previous page, under the "Positionless Weather Data" heading, you'll 
"NOTE:  The weather report must include at least the MDHM 
date/timestamp, wind direction, wind speed, gust and temperature..."

Ambiguity aside (I think a "Positionless Weather Report" requires the 
timestamp), it is valid to have a weather report without timestamp.  
Just assume time=now().

John Gorkos

On 10/23/21 10:48 AM, Matthew Adair wrote:
> I've been going over the APRS 101 specification and teasing it apart 
> using Heikki's excellent Ham::APRS::FAP library.
> Page 66 of the APRS101 document gives two example weather report 
> formats as objects:
> # Complete Weather Report Format — with Object and Lat/Long position
> ;BRENDA *4903.50N/07201.75W_220/004g005t077r000p000P000h50b09900wRSW
> ;BRENDA   *092345z4903.50N/07201.75W_220/004g005b0990
> The second object parses correctly. The first one does not.
> From what I can figure out, the reason is because the first object 
> doesn't have a valid time stamp. The 101 spec seems to indicate that 
> Objects require a time stamp. So, is the first object truly invalid, 
> or is a weather object without a timestamp a valid exception?
> - Matt, N8SHA
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