>>4338235 lb
Memeanon here. I have never done this precise task before but let me share my methodology; I think it's solid.
Opened the file in graphics program.
Drew a perfect (symmetrical) circle and stretched and fit the circle until it perfectly overlaid the outer circumference, and made sure its aspect ratio was exactly 1:1.
Stroked the circle red.
Measured the diameter of the circle.
Bisected the diameter to locate the X coordinate of the radius.
Marked this with a vertical red line.
By eye, drew a horizontal line bisecting the circle.
Where these two lines cross appears to be the center of the circle(s).
It appears to be RIGHT ON the shoreline of Chesapeake Bay.
Now I'm going to locate that point on Google maps and provide lat/long
and zoom in and see what's there.
Standby…
Reply if you find any fault with my methodology.