Tried Organic Maps, that wasn't working for me. So safe enough to install GMaps with Aurora and live a little? This is actually one of the very few uses I haven't replicated since moving to Graphene.
Discussion
Yes, to be extra careful you can use a secondary user to isolate it, from IPC and seeing any other apps installed as I imagine you won't be signing in for any data to be tied to an identity. The rest of the GrapheneOS privacy featureset will of course be applied eg no access to hardware identifiers etc.