You know them, those 4-man crews who have the very original idea to scuttle their ship at the outpost and then immediately rush to your ship where they hide inside your lower deck by using the emote invisibility glitch.
How to spot them?
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When you join the server, take your time to fill your inventory from the barrels inside the tavern where you spawn. By that time, they should already be inside your ship.
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If you don't know the name of the outpost, check and remember it on your ship's map table.
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Scuttle your ship and return to the outpost after heading to the mermaid.
Or maybe not, if there really were some stowaways leaving your scuttling ship.
Edit: Of course you only need to return to the outpost if you want to play as emissary. Any activated missions stay active after your ship is sunk, so you can do this beforehand.
- If you're in the middle of a voyage, suspect the presence of stowaways and don't want to scuttle your ship, use the blunderbombs on the deck areas to check if any hit markers appear. The most convenient approach.
Don't stand within the explosion radius or else you'll see hit markers from hitting yourself.
Alternatively, use the blunderbuss/cutlass and then shoot & slice everywhere like a lunatic.
Don't forget to check the ladders and the crow's nest though.
Try not to become paranoid.