Ok. So I did some work and I have dump of position reports sent in Garmin TIS by RS-232.
I attached this file and some screenshots.
Protocol is like described here:
http://www.garmin.com/support/pdf/iop_spec.pdfSo every sentence starts with 10 then 8C (packed id) then how long are data for eg. 48
then we have data...
on the end is checksum (AA) and 10 03
Maybe someone can help and analyze data section for lat/lon/altitude etc....
I know that garmin is using conversion's
degrees = semicircles * ( 180 / 2^31 )
semicircles = degrees * ( 2^31 / 180 )
Update!
After 2 days of research I found how to make it.
I have to decode some minor stuff but I'm able to display traffic by myself with altitude, direction, icon type etc..