We’re on our third Century HSI now. Since the latest refurbished unit was installed we’ve noticed a problem when using the NAV mode. It seems that when the course selector is set to the proper course (as indicated by the GPS), we consistently track 15 degrees to the left. If we set the needle to a course 15 degrees to the right of the desired track, we track fine. The same thing happens if we use a VOR signal instead of the GPS signal (VLOC or GPS mode).
Heading bug works fine.
Anyone with a similar experience have any insight? Thanks.