1540 comes from Nassau, not sure of the exact power but I can pick it up weakly at my location near Daytona Beach. Used to be a protected clear channel for Bahamas. As for 810 (Freeport), I used to receive it quite well here in E. Central FL until the 810 came on the air in Orlando back in '06.
Getting back to the original topic, a couple of times in the past when I went to the Outer Banks of NC I tried and was unable to receive any MW signals from Bermuda. However, it would not surprise me that they could receive some of the 50K signals from the northeast in the daytime (such as WFAN) as some of these signals even carry all the way down the coast to NC via salt water path. A friend of mine was in a yacht race from Daytona to Bermuda a few years ago, while he is not a DX'er he said they could receive a number of stations while at sea... So, if anyone has visited Bermuda with a radio, what stations did you hear from the states, day or night??