R4002,
It is the most probable that they are freebanders, generally Spanish speaking fisherers (from Argentina, Chile, Peru, etc) respect a more little the broadcast segments, the problem is that in the Americas are many spanish speaking countries, so they could be fisherers or just freebanders from the caribbean, and I do not have much information about radio operation on that latitudes. BUT according my conversations with the argentinean freebander the ID is correct. I'm not too sure but is the most possible hypothesis according also with what you describe in the log.