The brand new Garmin GPS I purchased in June is running Android 6. Completely absurd. Granted, it does its job of navigating fine, but it still has wifi connectivity.
At least, one can hope, that whatever ssl certs it relies on to do the job you bought it for - are under control of Garmin who can pay for non LetsEncrypt certs with Root CA trust chains that will work with their devices. How much non-map based access to Android does it expose? It'd suck if it loses Google Traffic API connectivity, for example.
It doesn't directly expose anything more or less, every app you have access to by default is Garmin controlled (except perhaps iOverlander). There's no play store or services, as far as I can tell. You can sideload whatever you want though.
