D 180 winds aloft after Garmin 795 update

[jamespearce]

Hi. I should say from the off I do not have an OAT fitted to the installation in my Aeroprakt A22 Foxbat (<100 Kts ) but until recently I have had sensible winds aloft reported by the 180 when my Garmin 795 is connected. However, I updated the 795 software and the EFIS is now displaying garbage numbers on some occasions. Any ideas? Thanks, James.

 

[Dynon]

Check the NMEA settings on the 795, particularly the advanced NMEA page. Make sure the data rate is set to normal and not fast. But if nothing has changed except the 795 software, it may be an issue with its software.

 

[jamespearce]

Thanks. I have experienced the data rate problem previously and aware that it should be set to normal. I may have found the answer whilst flying today though, by checking the Dynon headings being displayed compared to the 795 headings. I flew the cardinal headings and there were up to 20 degree differences. I'll try a compass recalibration tomorrow. I've no idea why it should be so much in error having calibrated it a year ago but it's a good starting point. Thanks for the input, I'll post the result of my recalibration.