Mike, We have left Marathon late afternoon, crossed to South Riding Rock then across the banks. There are really no anchorages
unless you go up to Key Biscayne and cross over to Cat Cay leaving just before daybreak. Depending on the speed of your boat you can anchor
in Honeymoon Harbor near Cat and cross the banks to maybe Chub the next day. There is also a marina at Cat Cay that you can stay and also check in. You can anchor
on the banks but you really want settled weather
. At least 2 and preferably 3 day good weather
window is desirable.