Lincoln offers two trim levels for its large SUV: the Lincoln Navigator and the Lincoln Navigator L. Both feature a 3.5L Ecoboost V6 engine that makes 380 hp and 460 ft-lb of torque--enough to tow up to 9,000 pounds. The engine is mated to a 6-speed automatic transmission with overdrive and rear-wheel drive. Four-wheel drive is optional on both models. The Lincoln Navigator has six airbags to protect all passengers, including bags that deploy from the headliner on both sides of the vehicle. The AdvanceTrac stability system has Roll Stability Control to apply the brakes and reduce the engine's power if the wheels start to slip and it controls under- and over-steer to minimize skidding and fishtailing. This system works with Lincoln's Trailer Sway Control to give the driver more confidence in the Lincoln Navigator's handling, even with a couple extra thousand pounds behind the rear bumper. Like many Ford and Lincoln vehicles, the Lincoln Navigator comes with Microsoft's SYNC voice-activated operating system. It works with Bluetooth devices such as cell phones, as well as USB drives and MP3 players. Helpful services such as a Vehicle Health Report and turn-by-turn directions are also available through the SYNC system. Parents of new drivers will appreciate the MyKey feature, which allows the Lincoln Navigator to be programmed with automatic driving restrictions. The top speed can be limited to 80 mph, and chimes can be set to go off as the needle passes 45, 55 or 65 mph. MyKey works with the BeltMinder system in the Lincoln Navigator to keep the audio system from getting any louder than 45 percent of its maximum capability. If anyone decides not to bother buckling up, the BeltMinder alert cannot be disabled and the stereo is muted until everyone clicks in. Standard equipment is very extensive. It includes power-deployed running boards, a rear-view camera, dual-zone climate control, memory seating, THX surround sound, heated and cooled front seats and power-folding third-row bench seat. Options include a dual-headrest DVD system, moonroof, 20-inch wheels and a heavy-duty towing package.