This web-based debug console helps you to check binary value of geohash for any point on the map. Calculated value could be found at the bottom line. You can control precision of calculation using slider below the map. Also you can visualize bounding box of geohash by ticking the option 'with bounding box'. Coordinates of corners and center of box are displayed when mouse is over it.
Click on the jar file or type java -jar geohash-debug-console-dist.jar in your terminal to launch this debug console. Then open localhost:8080/console in your browser.