Also, it's worth noting that you don't necessarily have to sign into a Google account to download apps from Google Play or even use many of Google's own apps. You can instead choose to download apps from Aurora Store, which sources its app selection directly from Google Play.
So, if you wanted, you could install Aurora Store, install Google Maps through it, install Sandboxed Play Services from the GrapheneOS app repository, and use it all without signing into a Google account. Google can still track you by IP address and by any permissions you grant to any of their apps, including Sandboxed Google Play, but you have much more control with this approach. You can also tell Sandboxed Play Services to route location requests through the OS's APIs as opposed to Play Services, which helps even more with preserving your privacy.
Keep the questions coming because we want you to have the smoothest transition possible if you choose to go with GrapheneOS!