chris0147 - you line up the dish and motor (set to 0) to point south wherever you are located. So, in the direction of the sun at local noon. Where I am (county Wicklow, south of Dublin)the sun is due south of me right now (12.25ish). If you are on the Greenwich meridian (which runs through London), local noon is at 12.00.
Assuming you have your north/east(or west) coordinates set correctly in the box you then tune to the satellite that is nearest your due south. This is the so-called "top of the arc" or closest to 0 on the motor. If you are in the eastern side of GB, then the 0.8W satellite is your "top of the arc". For someone in west Wales (or for me), then 5W is the top. The box will calculate the angle to the satellite from the location coordinates stored in the box. In my case, the motor will turn a little bit to the east as my motor zero position is at 6W (my longitude). If you were really accurate in lining up due south originally, then the dish will be pointing in the direction of the satellite. But that almost never happens, so you move the whole motor (and attached dish) slightly left or right to peak the signal. Now, you also have to have the motor elevation/latitude correct (in my case 37 degrees elevation or 53 degrees latitude) and you also will need to tweak the dish elevation where it is attached to the motor.
It would help if you gave a rough idea of your location (nearest town/city).
Here's a photo of my setup. The back wall of my house points exactly south (handy!). The photo shows the dish pointed at 5W which is closest to the top of the dish arc (nearest 0 on the motor).
