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[aprssig] Adding Water Gage and VOLTS info to APRS

scott at opentrac.org scott at opentrac.org
Wed Jun 28 20:51:42 UTC 2006

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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