I think that during prehistory the folk of the region would have been more concerned with the quality of the pasture and the availabilty of sweet water as opposed to grain yeilds.
Was it important to know where the centre of the cirlce was? In circles with precise alignments the information was encoded in the stones and the landscape e.g. Callanish
If you are looking for an unbroken lineage regarding the use of alignments, astronomy and navigation then as you imlpy, look at seafarers.