On Feb 3, 5:38*am, "PiperFlyer" wrote:
King KI-209 with MX170B, shows an error of 30 degrees. Is there an
adjustment screw on the indicator or a correction potentiometer on the radio
to correct the error? I work weekdays and the avionics shops are open only
on weekdays.

There is an adjustment. But: If it's off by 30 degrees, there is
something
wrong with the unit. The adjustment does not have anywhere near that
range.

Bill Hale BPPP Instructor

Fix radios part time.