My first kayak, an Aquaterra Chinook, had a decided tendency to turn left. The dealer told me that I just needed to learn proper paddling technique and all would be well. I snapped a chalk line down the keel and took a photo showing that the stern was about 1 1/2 inches out of line. I sent the photo to Aquaterra in Easly,SC, and they shipped a new, upgraded boat within one week. And that is the way business should be done. Jake