@simonrolph This is awesome! I think I found a bug though. The map claims that there are no Rock Pigeon (Columba livia) observations within 1 km of my location. However, if I pull up the map in iNaturalist it shows plenty of Rock Pigeon observations within 1 km of me, however, they are all IDed to subspecies (Columba livia ssp. domestica) rather than species. So it seems your tool is not recognizing subspecies observations within each species. Also, it would be awesome if I could move the pin or manually change the location somehow (perhaps with a lat/long field).