It’s outdated, unsupported, potentially dangerous, and often won’t work on modern phones.
Searching for and installing a "Garmin Navigator APK" from third-party websites (rather than the Google Play Store) carries significant risks: garmin navigator apk
If you are looking for an "official" Garmin navigation experience on your smartphone today, you will find it has shifted from standalone "on-phone" apps to tools that support specialized Garmin hardware or specific niches like aviation and marine. Garmin Drive™ - Apps on Google Play garmin navigator apk