Once the 14 days are completed and your clear of COVID19 your then welcome to cruise the area that includes Phang Nga Bay, Krabi Province, Trang and Satun Provinces and Phuket. There are no other restrictions once the testing period has past other than the normal required reporting per maritime regulations.
A very handy publication for on the water information is the South East Asia Pilot, which is available through your agent or at the Rolly Tasker Sails loft.
For weather www.windy.com has proven to be quite accurate for the area and the charts also clearly indicate the Thai marine national parks where fees are due for vising tourists. There are also lots of locations to visit by water or land that do not involve national parks fees which are interesting, picturesque and well worth visiting.
Please note the situation can change any time depending on Covid situation and Official decisions. Above article is written on best knowledge, dated March 2021, and without any guarantees from our side. Please investigate the latest situation carefully before you enter Thailand.