This tool is all about GPS coordinates conversion. As soon as you modify one end of the data (either the decimal or sexagesimal degrees coordinates), the other end is simultaneously updated, as well as the position on the map.
The GPS coordinates are presented in the infowindow in an easy to copy and paste format.
You can also start to convert latitude and longitude by clicking on the map, which will pre-fill the fields with the GPS coordinates of the location you clicked on. In any case, the address will not be geocoded automatically. If you want to convert the GPS coordinates into an address, you have to click on the button "Get Address" below the decimal coordinates.