I had a this issue last year with my 8.4 Nav. At first the compass was off and then I noticed my location being off by about 200 miles on the native nav map. After trying to figure what was going on I also noticed my Wifi wasn’t working either. So, I took it to the dealer and they could not fix the issue and they even worked with an FCA engineer to help troubleshoot to no avail. They ordered a new head unit which eventually arrived a few months later due to some sort of backlog. Everything is working fine now with the new head unit so far... funny enough, I got on the forum to research a message I received on the head unit of a new software update which was going to take about 45 minutes to install and then I came across this thread.
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