[aprssig] Adding Water Gage and VOLTS info to APRS

Robert Bruninga bruninga at usna.edu
Wed Jun 28 15:59:49 CDT 2006


Good question.  I was hoping that Vvvv could be added to
existing WX formats since it is consistent with all the other
WX fields and since they are supposed to be extensible, then
this would work (and still be backwards compatible).

So you could add Vvvv to any stand-alone WX systems.

But I dont see any reason why it could not be looked
for in any other position formats, though it is not that
unique so there might be some false positives.  But
if the device reports volts, then it would pick it up
every time...

I think it would be nice to use this Vvvv standard
since it is compatible with WX...

Just some thoughts.

>>> scott at opentrac.org 06/28/06 4:51 PM >>>
Does the Vxxx apply only to weather formats?  The OpenTracker uses xx.xV in
the status/comment text, but it wasn't really meant to be machine-parseable.


> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Robert Bruninga
> Sent: Wednesday, June 28, 2006 1:47 PM
> To: aprssig at lists.tapr.org 
> Subject: [aprssig] Adding Water Gage and VOLTS info to APRS
> To accomodate the addition of remote water gages to APRS,
> two symbols have been designated for such use:
> /w  is the water symbol
> \w  is the flood symbol
> Typically a water gage above flood stage would switch to the
> flood symbol.  The water level is added as a fixed length
> field of Fxxxx where xxxx is from -999 to +999 centimeters.
> In addition, we are adding Vvvv for indicating volts in tenths.
> Thus V128 would be 12.8 volts for this instrument.
> Notice that this format is similar to that used for all WX
> parameters, and since the APRS WX format is extensible,
> these Fxxxx and Vvvv can be added to any existing
> weather report without breaking anything.  Similarly,
> when the specific water symbols are used, then only
> the Fxxxx or optional Vvvv are needed, but an entire
> weather report can also be added if additional isntruments
> are available.
> The proposed spec is shown on the APRS1.2 proposed
> addendum page:
> http://www.ew.usna.edu/~bruninga/aprs/watergage.txt 
> de Wb4APR, Bob
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