It appears gpsd deprecated their alt attribute in favor of altHAE. When gps3 is used with gpsd 3.17, the altitude attribute is fine. When it's used with gpsd 3.19, altitude is always 0. (I suspect it's only reading the now-deprecated alt value that's always set to 0 or NaN).
It appears gpsd deprecated their alt attribute in favor of altHAE. When gps3 is used with gpsd 3.17, the altitude attribute is fine. When it's used with gpsd 3.19, altitude is always 0. (I suspect it's only reading the now-deprecated alt value that's always set to 0 or NaN).