Raider of the South Seas (1990)

The whole town becomes alarmed when our three teenage heroes, Bobby, Jack and Kate sight a mysterious black galleon sailing into the harbour with a lone bearded figure at the helm. Stories of enemy warships disguised as sailing ships fuel the mounting paranoia. Together the three young people befriend the 'Raider' and become involved in a plot to expose a local smuggling ring - a plan which leads them to be imprisoned in the galleon and at the mercy of the smugglers. A story full of suspense, intrigue and romance to delight the whole family. Based on novel by Franklin W. Dixon

Unfortunately the movie Raider of the South Seas is not yet available on HBO Max.