[SubConscious]

I find it much easier to set an exact course when using SimFeelings 6-Dials mod. It makes the compass absolutely huge and therefore much easier to select the precise course desired. You should be able to find this mod pretty easily in the "Mods" thread.

Another option is to determine the bearing to the exact course you want, look through your binoculars to that bearing and press the "=" key to set course to view. (edit: Sorry, this was just repeating the sound advice of RawRecruit)

Of the two, the SimFeeling mod is the better bet. Good luck!