The Florida Current, the start of the Gulf Stream, running north between Florida and Bimini a few miles off Government Cut and Port Everglades. Ships leaving Miami or Fort Lauderdale for the north ride it; ships bound south keep close inshore to stay out of it.
Source: HYCOM ESPC-D-V02 global 1/12° model (hourly surface current), via HYCOM.org; coastline OpenStreetMap
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