Good afternoon Doreensdream,
Thank you for your inquiry.
Couple of questions, you posted in the TZT forum so are you getting a deviation alarm on the TZT unit or is the alarm coming from the autopilot?
If it is coming from the autopilot we may relocated your post to the autopilot forum. It would also be good to know what autopilot you are using.
Kind Regards,
C-Bass