There are several places east of Marathon where you can leave Hawk
Channel and head across, but I'm assuming your real question is how far
south can you enter the Bahama Banks? If so, then you are probably
thinking of South Riding Rocks. The waypoint from the Explorer chart
book is at 25-13.40 N, 79-09.20 W, approximately .5 NM south of the
South Riding Rocks Light. From there the next waypoint is at Northwest
Channel 25-28.20 N, 78-09.60 W. Some people recommend taking a dog leg
at Russel's Light, others not.

How do you like Isla Mujares?

Wayne B
(currently anchored at Green Turtle Cay, Abacos)