The J/Boats "J" logo and boat logos use the "Souvenir" font. It is available as a free Truetype font download at this link:
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 Zipped

J/30 Logo in EPS Format