Wind Angle = nil; with NGT-1

[captcha1]

I don't know why, but sometimes wind angle is "nil" (should be around 260). Sometimes it works. I'll try to isolate it.

01:34:34.050 ▶ DEBUG 10958 2018-02-28-01:34:34.049 2 5 255 130306 8: 00 7a 02 38 b8 fa ff ff

01:34:34.052 ▶ INFO 10959 2018-02-28-01:34:34.049 2 5 255 130306 Wind Data: 0.SID = 0; 1.Wind Speed = 6.340000; 2.Wind Angle = nil; 3.Reference = Apparent

The only difference I see now is the order of powerup of NGT-1 / argo / the rest of the instruments. It works the NGT-1 & argo is started and then the rest of the system gets power. It doesn't work if I power up the instruments first and then power up the NGT-1 & argo.