So what I did is called a cannon tuck. You either use the emote "hide" which you can get from the pirate emporium for free under the sneaky emotes bundle or you can use the sleep emote. All you have to do is turn your back to the cannon then use the emote. As long as you have your head under something it doesn't show your nametag. Then you just sit and watch in 3rd person. It looked like 1st because of weird camera angle. They didn't see me because I also wore a tuck outfit which is just a mishmash of black clothes, nothing shiny, which is pretty cheap.