I installed an RNS315 the other day, worked fine during testing. The next day, its location is about 600 miles off in Canada. Then the location was jumping around. Any ideas? Could it be an antenna problem? Here is the coding of the RNS-315. The compass module was unplugged and position sensing was turned off in the CAN BUS with navigation turned on. This is on a 2012 Golf 2.5 with CAN BUS# 7n0 907 530 h. Attached is a screenshot of the rns315 coding.