Have you considered contributing to #OpenStreetMaps? It's like Wikipedia but for maps - a map that everybody can edit! Today, the NSW Address Import project added thousands of addresses for West Pennant Hills, Warrawee, and West Pymble.
If you know those areas, check it out and start mapping!
@thinkMoult Once you understand some of the basics (how to add and edit map objects in the online map editor, id for example), you can help humanitarian tasks internationally at https://tasks.hotosm.org/ too!