Here are some good words concerning another of the possible anchorages avaiable off the “Back Route” from Marathon to Key West. This one requires a longer trek off the main route to Key West, but if you want to drop the hook where few have been before you, fire up the GPS chartplotter, and give these waters a try.
More on this anchorage at: http://www.CruisersNet.net/94-cudjoe-key-channel-tarpon-belly-keys-anchorage-2
June 2009. Anchored off Tarpon Belly Key. First attempt to anchor failed, but found good holding further out from the key in deeper water. Lots of current thru here carrying grass that found its way to my sea strainers. Feels wide open but is sheltered by all the surrounding flats. Very easy to find your way in and depths are pretty much as shown on chart. Watch for “Fat Albert” baloon that flys from a cable nearby to put radar high in the sky. We noticed that when they bring Albert down, the wind may soon blow hard.