In FS 2004 you can look for anchor symbols on the map.
For examples search for W36, 0W0, W55, 06B, ME27, ME37, 76B, ME01, ME09,
ME80, ME43, ME28, ME51, ME90, ME57, NH64, 6MA0, MA2, 4NJ2, 2N7, NJ00,
6N6, 6N7 (East River NYC!), 6FL5, 61FD, FA75, 42FL, FA05 and X44.
Some apparently have problems with their altitude data in the simulator
(Not responsible if your simulated plane materializes several hundred
feet above the water)