GPS antenna required for sync 3 conversions. Many of the cheap ones available on ebay and amazon will throw a navigation error or not show correct location. This will eliminate those issues. We have been using these and they have been very accurate and will not throw any errors. There are plenty of antennas that look similar but do not work the same.
Easiest, straightforward installation ever. Direct plug into APIM module, found an under-dash spot for the antenna, used double-sided tape. Turned radio on and both instrument panel compass and stereo Navigation clicked on - no calibration needed!