John,
Resynchronising improves the precision of the tracking. At the end of the day the alignment we do, be it auto, two star etc. is still rough. Good enough for viewing objects for a while but things wont appear dead centre in the eyepiece or track perfectly for hours. When precision is required, centre on the object that you've just slewed to, press and hold enter for two seconds and then press enter again. This tells the telescope that you're now centred on the object and this will now improve the precision for the part of the sky that you're now looking at.
To align the scope to true north I bought a cheap orientering compass which has a dial you can turn. I turn the dial 12 degrees to the west and then I can line up the needle in the parallel bars. I put it up against the flat edge at the rear of the tube (where the eyepieces connect to) and rotate the scope until the compass needle lines up. The dial on the base of the scope wont help you as that's for determining Right Ascention (RA) which is measured in hours, minutes and seconds.
Cheers,
Greg
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