JEM Watercraft

This is my first attempt to build a boat. Can I use exterior grade birch plywood on the 11' Dinghy Vee?

Welcome to the forum. Birch is an excellent choice for building stitch and glue boats. Epoxy stick very well to birch and it is nice looking type of wood. Since the plywood is exterior grade that makes it suitable for building your dinghy. So there is no problem in using the plywood you suggest.