According to the
privacy policy navigation data is anonymized:
"We also may collect similar data in connection with other features, such as the navigation data for the online routing feature, and may share it with business partners where necessary to provide the feature to you, but, again, we only collect or share the data in a way that does not identify you or your car."
But it's probably very easy to de-anonymize the data (because it's likely to frequently contain your home and/or work locations).
Generally, I'd also like Tesla to be more transparent about their data retention policies. They can potentially collect loads of sensitive personal information ranging from location data over listening habits to information such as contacts and calendars that you share with the vehicle. Ideally I would like them be voluntarily compliant to the EU GDPR regulation even in the US (e.g. giving the owner full transparency about what data is being collected, and allowing them to have the data erased).