User blog comment:NickyLinnea/Ship Customization Rigging Patterns/@comment-4468389-20111111204636/@comment-1140008-20111114120720

It changes your sail's style, and your mast's color. But, in addition to that it boosts your sailing skill. You can choose one of three tracks to go down. Offense (Open Fire Boost), Defense (Take Cover Boost), and Speed (Full Sail Boost). Each has two ranks.