You can game it any way you want, but the fact remains that you know more and others are safer if you take the test than if you don't. And the closer you take it to boarding the better. And the higher quality test (NAAT vs lateral) the better.OK, my plan was to take a flight from London to Puerto Vallarta, then on to Los Cabos via Mexico City. Then a couple of days at Los Cabos before getting on the liveaboard. The operators say:
"ALL GUESTS ARE REQUIRED TO SHOW PROOF OF A NEGATIVE COVID TEST TAKEN WITHIN 72 HOURS BEFORE
BOARDING"
I would get the test in Cabos. I understand that it takes 3-5 days after exposure before you test positive. So my test in Cabos is effective to check that I haven't caught it off the few dozen people I may have met in the days before leaving London. But nothing is done for the far greater risk that I might have caught if from any of the thousands of people I will have passed when flying. That's the same for all guests on the boat. Our trips are being put in jeopardy to give us negligible protection in face of bigger risks that we readily accept. If the operator can't make that point to clients who get Covid on the boat, or in its defence in any potential litigation, then I think it's spineless.