You can, but must not stay connected online for rerunning the applet. The calculation of the map at the 0.5 resolution takes several minutes. Thats why we start with a coarse resolution of 4. Click with the mouse inside the map to get the value at the pointed location or enter direct Latitude and Longitude, then click on the calculate button. Change the Maptype and resolution then click on redraw to compute the new map. Breaks the map computing using the break button.