I did it twice .
1) call the vts on the
phone they will ask for your
boat details and then give you information about the currents
2) stay on the side but always check your
GPS speed to clarify if the
current is against you , if the
current is against then traverse a bit sideways until you have current helping you .
3) be carefull for liners coming out of
ports they don't care about you and with the current from behind can be tricky to avoid them
4) Eddie's are fun

on the first time my
boat did 360
5) you can do it under sail as well , just make sure not to interfere with the traffic .
6) if you can't call the vts by
phone , call them in the
VHF , both times was easier for me.to get them by phone .
* I never contacted the coast guard neither thought that I need to bother them.