Quite a bit depends upon where in the
Caribbean you are. I'm in Grand Case, St. Martin right now and tend not to lock my
dinghy to the
boat at night. But just a bit further, in Marigot, I
lift up my
dinghy and set my manual
alarm (fishing line and bells).
I am somewhat careful further south and in
anchorages that are more
remote.
If you can get an alarm installed then it certainly won't harm. Something that turns on all the lights and beeps. The
security bars are, in my opinion, too much for typical use where you need hatches open for ventilation. Sailboat entry
hatch locks are meant to keep honest people honest. Determined boarders will go through most measures we can implement on a sailboat almost without breaking step. But most boarders aren't that determined, fortunately.