They will work fine in the Port, although it may be illegal to use them in foreign ports.
As a broadcast person, I did not take ours because techinically they should not work very well with all the metal on the ship. They broadcast over what is known as a "line of sight" frequency, they need a clear unobstructed path between them.
After having read the experiences of those who used them on the ship, my opinion is that they MAY work, but not with 100% reliability. So if you have room, pack them, just don't stake your life on them working. And as mentioned above, I would not use them outside the U-S since laws for their use may differ in other countries.