On Sunday, January 6, 2013 10:00:38 AM UTC-5, son_of_flubber wrote:
On Sunday, January 6, 2013 5:13:39 AM UTC-5, Kimmo Hytoenen wrote:

I have discussed

with some variometer manufacturers about their data

communication protocols, and some of them either do not disclose

information, or do not give correct information.



That's not surprising. The vario-makers are in competition with each other, and perhaps more to the point, the early adopters of the new varios are in competition with each other.

FWIW, ClearNav CNv XC, due out Mar 31, will provide GPS and air data out on the serial port according to the CAI dataport standard, which anyone can use.

Evan Ludeman for ClearNav Instruments