The dodger protects the cockpit from spray. It also covers the companionway (entrance to the cabin), so you can keep it open when it rains.
Note the cockpit tent (rolled up, far right of the photo), which extends over the cockpit like a "convertible top", giving dry shelter at the dock.
This is just one of many examples of the fine thought that Dragonfly gave to the design and systems on the boat.
