[aprssig] barometric pressure units

Andrew P. andrewemt at hotmail.com
Sun Nov 4 21:21:35 EST 2012

Greetings, all.

There seems to be a discrepancy between the APRS protocol specifications and what stations are actually sending regarding barometric pressure values. The APRS 1.0.1 specification says on pages 64 and 67 that pressure should be reported in tenths of hectopascals (or tens of pascals), but most stations (at least in my area) seem to be transmitting pressure in pascals. But there are other stations transmitting other units (what units could a pressure of 8272 be?).

Is this a bug, or a change in the specification that I haven't found in the newer revisions of the protocol specification?

Andrew Pavlin, KA2DDO
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