430 Test Page OBS Limits

[ARFlyer]

While going through an instrument cockpit check with my student, I got asked a question that I didn't know the answer too.

The student inquired what is the error limit on the CDI course vs indicated OBS course. He asked this because he noticed that the GPS is 2* off what he twisted in on the CDI.

I've looked at the 430 manual, FAR/AIM, and PHAK with no help. Apparently there isn't a limit on the amount of error between the two ?

I've always just checked for the half up/ half left needle position and the OBS showing roughly the twisted CDI.

 

[kgruber]

That error can be adjusted out in the setup routine.

 

[ARFlyer]

That error can be adjusted out in the setup routine.

Interesting

So I guess your CDI could be 20* off and you just make offset inside the GPS.