You can use the regular google maps also. It will let you drawing a line around your ponds edges. Then it will til ya the exact area inside the lines. That feature dosnt work on my phone but very easy on desktops.

The people who say I can't do it can just sit the @^#% down and watch me. Friends call me Rusto I also subscribe to pond boss mag. http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=504716#Post504716