fsphil / ax25beacon Goto Github PK

I personally prefer SI units, and GPS NMEA reports altitude in meters. But the APRS specification says altitude should be reported in feet, not meters.

http://www.aprs.org/doc/APRS101.PDF

aprs.fi also seems to show altitudes in feet.

I am not sure if this is supposed to be above sea level or average terrain; the spec is silent on that issue, but the "antenna height" field is supposed to be feet above average terrain.

http://www.aprs.net/vm/DOS/PROTOCOL.HTM

I think we should have a switch for altitude unit conversion; if the switch is "on/true", then input will be in meters but output will be in feet. If switch is off, then data will pass-through without any unit conversion (presumably this will be for reporting in feet, or meters if you need to maintain backward compatibility).