We did a 7 day B2B in March from New Orleans to Western Caribbean. On last sea day of first leg, before arriving in New Orleans, we went to Bliss Lounge , had a quick covid test (negative) and were given a wristband to wear at debarkation. We were also given a new room card (same cabin). At debarkation, we were walked off the ship, and had to re-enter, go through security and then went back on ship. There was no charge for covid testing between cruises. Can’t answer about latitude level as we were sapphire prior to boarding and remained the same