Gmap of Users by City versus Lat Long

sorry if this is a simple question, but I can't test the module out because i don't have an api key yet.

Is it possible for gmap to post a marker based solely on city location data?

What i mean is that I think gmap places markers based on lat/long (but i'm not sure).

I don't want users to have to find out what their lat / long are and then plug those into according fields.

And i don't want them to have to type in their street address (that's too personal for what i want to do).

Instead, i'd like them simply to be able to only have to type in (or use a select menu) a city on their user profile form (or some other form). Then gmap will be smart enough to do a lookup on the city/state to autoinsert the correct data into the lat / long fields. That way a user node can be auto mapped to a gmap marker overlay.

Qs

1) Does this currently happen with this module?
2) If not is there a way to do it?

3) Would the following be possible?... An alternative method would be to allow the user to select their location on the user profile form by clicking or navigating on another gmap popup window. That would autoinput the lat/long fields and city name for those userprofile fields.

thanks much