By the modern wonder of Google Earth we can zoom into that monster hunting spot on my last post. If you have Google Earth the coordinates of the pier are:
I have annotated the picture with a few items. The lines A, B and C effectively show the limits of the line of sight I would have had from that vantage point. Line B is limited by the head land to the left and extends about 1.5 miles. Line A goes along the southern shoreline but ultimately stops at the distance to the horizon which is marked by line C about 2.5 miles from my vantage point. In practise nothing much will be conclusively recordable at such distances.
All in all, I would say I had theoretical coverage of about 12% but less in practise if any meaningful evidence was to be recorded.