Examples for Use Case: Add a custom control to a map

These examples use a custom control which is updated to show the latitude and longitude of the map centre when the map is moved. The map is initialised with a marker at its central point. When the map has been moved to another position, the "Mark" button will move the marker to the new centre. Whenever the map has been moved such that the marker is not at the centre, the "Return" button will re-centre the map on the marker.