To find your grid square / locator simply click on the map - Double clicking will zoom in.
You can also click and hold your mouse button down, then you can drag the map around.
 
There are also two other entirely different full-screen versions of grid square locators available

CLICK HERE or CLICK HERE


(If the map area below appears blank, it is because the sever it is on is quite slow.  Just click on one of the two links above instead.)