http://www.dishpointer.com/
Diseqc is a way to control motorized dish.
Usals is a program in the receiver that uses above diseqc
with usals you have to point the dish to 1 sat position 0.8°W in your case. If mounting pole is 100% plumb on 360° and dish elevation is set correctly, the USALS program can guide the dish to each location.
Diseqc: you need to manually program each location.
1st choice: USALS if your receiver supports it.
otherwise Diseqc 1.2 (1.0 & 1.1 switch & fixed lnb)