key west to isla mujeres
Bar, I''d encourage you to look at the Gulf Stream''s ancillary currents right before departing, if you aren''t already planning on it. The main flow splits after departing the Yucatan Channel, one segment flowing north into the Gulf but, then due to temp and salinity variations, both cold and warm water eddies spin off this Gulf-side flow. These eddies appear and then disappear, or shift about, and looking at their development over a period of several days can be instructive when finalizing your routing, whether direct from KW or via the Dry Tortugus. Unfortunately, if you stop for a visit (which I''d recommend), then the timeliness of this current info is lost.
You could also find as you approach the Channel itself that you''ll see a very active sea ahead of you, like there''s a squall up ahead but without anything in the sky - it''s quite wierd. This will be an eddy flowing against the Stream, it will kick up a fuss on the sea''s surface (beyond what''s already there in wind wave form) and bounce you around a bit, but will then disappear some miles later. It''s a good indication of how much power exists in an eddy, and why riding one might save you some time.
Hope you have a good run.