The first thing that poped into my head
was - Head
East from Florida
. Seriously it is @ 90 mile off of Jacksonville
and @12 -15 miles off of Ft Pierce. You can usually tell you are in the Gulf stream
with the following method (all work):
Listen to the weather
on VHF weather
channels they give the approximate location of the Gulf Stream every 20 minutes or so. If you don't hear it for your location change to another weather channel (1-10) and you will likely hear it.
Look for the blue water
that is approximately the color of Gina Smith's eyes (sorry - girlfriend in High School
Use a handheld thermometer to see when the water
Run a fishing
line behind your boat and when you hear wiiiiiiiiiiizzzzzzzzzzzz. You are likely at the edge of the Gulf Stream.
Call a friend on their cell phone
and ask them to look it up on one of the many web sites.
The reason no one can give you an exact answer is the Gulf Steam moves around - ALOT. Just like a firehose that is not secured it goes all over the place.