I have just purchased a portable mini dish (380mmH x 350mmW), with no elevation scale. How do I calculate the 'built-in offset angle'? Dishpointer.com gives the elevation as 36,1* and azimuth(M) as 82,3*E- this very different from the recommended Azimuth of 68*E. Our DSTV Satellite is 68,5*E Intelsat 10 (IS-10) I Intelsat 7 (IS-7). Which is the correct reading/setup. I would be grateful for any help!