Calibration for a Gentex 177 mirror?

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JJZ71

OBS for life
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Got the mirror wired yesterday but cant get the compass calibrated. Mirror in my last truck all I had to do was drive in a circle but it was a different style (single display and had to flip between temp and compass). This one has dual display out of a 2001 Silverado. If I hold the compass button it will flash over and say "cal" but what do I do after that? I drove in circles and its still not right. Thank god the mirror wasnt set to celsius.
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JJZ71

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GOT IT! I'm in zone 9 not zone 8.
 
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