You don't need to get a PCR. I am just saying that I think that is what I will do for my family because, it's free where I am and no waiting or referral to get one. (RATS cost us money), and I can do a PCR up to 72 hours out from the cruise. None of this worry about having nothing to upload outside of 24 hours. Just seems easier for us. But if you have a RAT test or that is what you prefer then that is the way to go.