Hi there, I've just updated my SynScan from version 3.35 to 3.37 and I've noticed a couple of changes. Firstly, you now have to enter your elevation (not sure if that makes any difference). Secondly, there are a couple of new features added.  Cone error and NP error. I know what cone error is, but I have no idea what NP error is? There is nothing in the latest skywatcher manual to explain it. Does anyone know what it is, and if I need to bother with it? Version 3.35 was working fine, I onl