One of the rules in the second edition (also the first if memory serves me) was hunters could not backtrack at sea. Thematically the notion was that the hunter was on a ship and could not for example move from Dublin, out into the Irish Sea and then return to Dublin. The hunter would have to in this case make port in Liverpool and then back out to the Irish Sea to once again land in Dublin.
In the new edition there is to my surprise no mention of this longtime rule. Thus it would seem hunters can in the new edition leave a port city and then on their next turn return to the very same port they just left. Is this an omission or a purposeful change in the rule? It's a rule that for me makes so much sense that it seems odd if it were purposely removed from the new edition.