Maria_and_Steve said:
Actually it is absolutely essential to clear in and out of Martinique! Failing to do so has the usual penalties of losing your vessel or going to jail.
Never forget or avoid checking in and out of at ANY French island.
I think he was saying there's no need to check in and out if you simply stay in Martinique the whole trip.
And one should always check in and out when required, regardless of where they are.
