Lighter, the Victory Sings at Sea version on Youtube is close to what I am calling the "older, traditional" version from the printed collections. It is close to that of the Clancy Brothers. (I feel a little bit awkward using the Clancy Brothers and Paul Clayton and A.L. Lloyd, all of whom were folk revival singers, as exemplars of "older" and "more traditional" versions. But it is the tune, along with the California verses that I am trying to distinguish in comparing these versions to the Odetta, KT, Highwaymen, and Weaver's versions.)

http://www.youtube.com/watch?v=nPIcwFKrTus&feature=related

The "Round the Bay of Mexico", while it may be related, especially to the Lomax/Hunt version of "Santy Anno", I think is a different song.

http://www.youtube.com/watch?v=06G7WlXZzIc

The "original" Bahamian version of this is beautiful. And Gibb does a pretty good job of capturing that:

http://www.youtube.com/watch?v=OilQra0NlRg