Rijksdriehoek Coordinates is a free Android app developed by Peter Hazenberg that allows users to easily look up coordinates using the Dutch RD grid or Rijksdriehoek system. With this app, there's no need to fuss with romers or large paper maps, as the results are available directly on your phone.

Users can look up coordinates on the map or manually enter them, and the app also allows for finding one's current location. The Rijksdriehoek coordinate system is maintained by the Dutch Cadastre and is used extensively by Dutch scouting groups.

Rijksdriehoek Coordinates uses the Proj4j library from OSGeo, ensuring accurate and reliable results. Overall, this app is a great tool for anyone who needs to work with Rijksdriehoek coordinates in the Netherlands.