Check WELL AHEAD of travel. Regulations and Laws are very different from country to country. I think we just had a member say his machine was taken from him when he got on the ship.
Be nice - specially for newbies - if we could try to make a current list of
airlines machines are banned
cruise lines they are banned
destinations they are banned
over the yrs have heard of scams by police depts. or security forces that either ban with no laws or rules
or have asked for money - unlawfully - to allow you to do it
I went to Portugal yrs ago - land police had no prob - marine police had major prob
Ive only been on 2 cruises both on MSC - no prob on cruise line
one destination was Bermuda - needed to get a permit - heard of more than a few
that got caught without one

I hunted Jamaica yrs ago no prob - then 2nd trip first few days fine - then went to spot
young security broke balls and i had to stop - after that trip was planning a 3rd - heard there were new signs
prohibiting detectors - I had group of friends get stopped at customs and had machines taken
returned upon leaving