Currently, GeoData is restricted to a narrow use case of searching within a radius of 10 km (20 km on Wikivoyage). That's mostly sufficient for apps or mobile web Nearby, however not even nearly enough for a general use of displaying POIs on a map with wildly varying zoom level. We need to bump it seriously, making sure that we don't permit queries that are too slow (i.e. sort all the pages on enwiki by distance).
CC CIrrusSearch team for performance considerations.