Davit...from St. Augustine...the advice is to sail south to at least West Palm...then cross the stream. You can check in at West End if you make a day crossing.
My preference is to leave at midnight for the Memory Rock waypoint...arrive in daylight onto the banks and keep going to great sale cay. From Great Sale cay anchorage...then go toGreen Turtle Cay the next day and check in there. Wait for good weather for the Whale Cay passage and they you can head to Marsh Harbor. Cruisers net is ch 68 8:15 daily on the VHF once you get to Green Turtle.