Ahoy, enthusiasts of sea-faring vessels! Jump on board for the New England Boat Show at the Boston Convention and Exhibition Center through February 21. This grand showcase of all things nautical features more than 800 new boats from over 400 vendors spread out across the convention center’s 450,000 square feet. From luxury yachts to small craft, and even a variety of sailboats, there’s plenty for both potential buyers and dreamers alike to gaze upon longingly. Other highlights include dozens of seminars, informational clinics, interactive displays, contests and giveaways, activities for young sailors-to-be and even an appearance by Captain Dave Carraro of the Gloucester, Mass.-set reality series “Wicked Tuna,” who is there to sign autographs and greet fans from February 19–21.