good idea but ...... just wanta point out some stuff
1 if using Google maps you'll need their full permission even if its just a basic overlay map to use their maps
2 with so called good spots it may become like Dunolly very flogged and you'll always get people jumping fences and dredging creeks and excavating old mine mullock heaps if its shown as rich on a map or any records
3 I would put a disclaimer on it saying the maps and things put on it may be not marked in exact locations etc. and your not responsible for any injury or death from mine shafts that are marked or not marked on your map or other dangers like waterfalls steep 4x4 tracks closed tracks etc. basically just covering yourself. in case someone wants to sue you for the smallest thing
4 also you want to copyright your work if you don't someone may take your idea and make it their own before you can publish your maps.
there's a whole lot else I can say but for now these would be the key issues.
1 if using Google maps you'll need their full permission even if its just a basic overlay map to use their maps
2 with so called good spots it may become like Dunolly very flogged and you'll always get people jumping fences and dredging creeks and excavating old mine mullock heaps if its shown as rich on a map or any records
3 I would put a disclaimer on it saying the maps and things put on it may be not marked in exact locations etc. and your not responsible for any injury or death from mine shafts that are marked or not marked on your map or other dangers like waterfalls steep 4x4 tracks closed tracks etc. basically just covering yourself. in case someone wants to sue you for the smallest thing
4 also you want to copyright your work if you don't someone may take your idea and make it their own before you can publish your maps.
there's a whole lot else I can say but for now these would be the key issues.