Grock is a free and open source maps application for Linux. Using Grock you can view Map and Geological data of united kingdom. It is based on libchamplain and released under GPL-3.0-or-later license. The geological data of UK provided by the British Geological Survey and map data by Mapbox. It is a simple and easy to use UK map application. You can switch between satellite imagery, magnetic anomaly, gravity anomaly, and linear features.