I've never heard that or seen any evidence of it. We've met Canadians
just recently that cruise to Cuba quite frequently and they reported
no such issues. It would be technically difficult to jam GPS signals
over any distance other than by satellite or high altitude airplane.


I understood that "selective availability mk2" (or whatever it's known as) is
the capability to selectively deny access to GPS signals over limited
geographical areas, maybe this has some bearing ?

Boo