You know, there may be a gasket...I haven't even taken the compass out of the box yet. I'll check tonight after work. Installation of the compass occurs next weekend. Been too busy hull cleaning and VC17-ing the last couple of weekends. The butyl tape was slated more so for the four portlights I'm replacing, but though it's good to have for the compass as well if needed.Good point. I don't know if the new fn-201 comes with a gasket but if not, Bed-it tape is the way to go.