Hi Ray,
The platform should support this by allowing you to set the appearance attribute of a Geopoint Question to:
maps
which will initially zoom in on the user's location and then let you set a manual location by single clicking the map (make sure you tap and don't drag when you are selecting the point).
This is a little used feature which appears to have a small bug in current releases. We will get that hotfixed ASAP.
If you want to prepare the form and test the functionality, I think the APK from our continuous testing/integration pipeline should work correctly to reflect how the feature will appear when fixed.
The other alternative would be to enter the data with Web Apps which will let you pick geopoints from a map UI as well.
-Clayton