CDI, autopilot, Approach, Localizer issues

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Hello Everyone,
     Just got the GTN 750 and absolutely love it but I've had a lot of issues that I have had to sort out before I am where I am at now but I still have minor quirks that I would like help with.
I had issues with the CDI where I could not get the GPS to work properly, the HSI needle would jump around everywhere and the autopilot wasn't able to follow the flight plan because it would disengage within a second.  I was then made aware of a secret button at the bottom of the GTN 750 that when pressed while in GPS mode corrected the issue, what does this secret button do that fixed the problem?

Second, I had the correct frequency for an ILS approach but when I was established with the approach button engaged the plane (BAE Jetstream 32) failed to follow it down to the runway and I had to manually fly and land which I love to do on this plane.

Thanks Everyone.

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I don't know about this secret button, but if any one find it out!

The first thing you have to make sure of is that your settings panel reflect the expected connections: HSI, Autopilot etc... AND the GTN is the MASTER (see the GTN plugin menu).

Otherwise, it may depend on how the aircraft you are flying with is more or less 'interfering' with the default X-Plane A/P. You might want to compare with the default B58 for example.

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