If you can see the 'centreline' directly down the LHS of the engine in a side-by-side configuration, I'd say that's near on perfect. If you can't see it because you're off to the left - then it begs the question as to what are you using for a guideline.
Once you get off the sealed runways, then it's necessary to use other 'lines' for guidance. These might be other wheeltracks or grader lines on a gravel strip, the farmers ute tracks on pasture, crop lines on stubble paddocks, or even sheep tracks on older pastures.
happy days,