Here left you can see the QTH Maidenhead Locator map.
If you click on some area, it will show you the area perimeter with six-characters Maidenhead Locator and its GPS coordinates.

You can also measure the distance and azimuth between two Locators: click on the first one Locator than, when window appears, click on “Define as start point for distance and azimuth” and finally simply click on the second one Locator. A new window will appears showing distance and azimuth “to” and “from” the two Locators.

If you know the Locator and would show it on the map, you can enter it on the right below text field.

Thanks to F6FVY Laurent Haas and F5UKW Cédric Morelle for this tool.