The Maps and Listing in PocketEarth come from the great community driven open mapping project called OpenStreetMap or OSM. While some locations have excellent data, some times even better than google maps, there are still many places which could be improved. If you have time, we hope you will check out the OSM website and consider contributing to make the maps better for everyone.
You can also enable Wikipedia articles (shown as W icons on the map) by going to Settings > Data Cache > Wikipedia > ON.
We are also considering adding support for other supplemental data sources of POIs in the future.