Manual Inspection flight using existing maps

Being able to view existing maps in manual flight mode would be an immense benefit to the inspection of new facilities that are not listed on Google Maps. We need to be able to choose to have an existing map that we have completed as an “offline map” option that we can toggle on and off if needed for inspection. We could then place annotations in real time similar to DJI FlightHub 2 but for a much larger variety of drones.