The Lincoln Navigator is a full-size luxury SUV built by Lincoln. Introduced as a 1998 model, production began May 14, 1997 with sales beginning in August. The Navigator was Lincoln's first SUV as well as its first four-wheel drive capable vehicle. The Navigator shares its platform, mechanical features, and other equipment with the Ford Expedition, which was introduced a year earlier. Unique and upscale styling, interior materials, and other features differ the Navigator from the Expedition. Given its platform mate, the Navigator is the largest vehicle Lincoln currently offers, having the greatest cargo capacity and seating for seven to eight people, depending on the model. In 2007, a longer, extended wheelbase version of the Navigator called the Navigator L was introduced, increasing cargo capacity further. Since its introduction, Lincoln has offered only one engine choice at a time in the Navigator in any model year.