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Did some additional research and trials. I don't have a final conclusion but I can describe some additional insight. My LG5 has something to do with the behavior, Android Auto and MyLink are both involved as well. As of now, this is what I am able to determine.
1. GPS Navigation using just the phone in Google Maps and Android auto without the MyLink works as expected.
2. Once I connect the LG5 to MyLink, GPS lock is flaky, navigation is flaky, and not reliable.
3. Based on research from other forums, I made some changes to the setting in the LG5- adjusted battery optimization, set Location to GPS only. In addition to that, I started the Android Auto app and plotted the destination prior to connecting to MyLink. Under this scenario, AA in MyLink work the best with less drop outs and behaving less flaky.
I am hoping that someone has experienced something like this and can isolate the causes.
BTW
1. GPS using OnStar work fine.
2. Still not lear which GPS antenna is being used in AA mode Car vs Phone
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