"J" logo and boat logos use the "Souvenir" font. It is available as a free Truetype font download at this link: http://www.fontfiles.com/Fonts/Detailed/707.html
I think you need to apply the Italic and Bold attributes to get the desired "J Boat" font look.
Steve Campbell from "Quicksilver" provided the J/30 logo in various graphic formats. These are saved in a single Zip file so you can select the format you want for your software application. J/30 Logo Various Graphic Formats ZippedJ/30 Logo in EPS Format