I used Yellowfin measuring tools to measure height of underwater stuff.
Interesting stuff. 4.69 ft. is not the shadow height, but is structure height.
http://i188.photobucket.com/albums/z...napshots/1.jpg
http://i188.photobucket.com/albums/z...napshots/2.jpg
http://i188.photobucket.com/albums/z...napshots/3.jpg
http://i188.photobucket.com/albums/z...napshots/4.jpg
http://i188.photobucket.com/albums/z...napshots/5.jpg
http://i188.photobucket.com/albums/z...napshots/6.jpg
