Everything You Need. Nothing You Don't. The Great Lakes 420BL Coach is designed around a simple philosophy: a good coach boat doesn't need unnecessary bells and whistles. It needs to do its job, and do it well. ​Built for sailing clubs, instructors and training programs, the 420BL offers a straightforward, functional layout with the essentials coaches need on the water. ​Its lightweight aluminum hull, generous 20-inch tubes and practical design make it an ideal choice for everyday sailing instruction, training sessions and regatta support. ​No unnecessary extras. No complicated features. Just a capable, dependable coach boat that gets the job done. Because sometimes, simple is exactly what you need.