The map and profile of definite location of such railroad, wagon road, or tramway, to be filed as hereinbefore provided, shall, when the line passes over surveyed lands, indicate the location of the road by reference to section or other established survey corners, and where such line passes over unsurveyed lands the location thereon shall be indicated by courses and distances and by references to natural objects and permanent monuments in such manner that the location of the road may be readily determined by reference to descriptions given in connection with said profile map.