The Nav-Mat II's bottom surface is coated with a Temporbond material. This tacky substance allows the mat to stick to nearly any hard surface, yet remain easily removable and reusable. The adhesion is strong enough to suspend the Nav-Mat II upside-down from a hand for a few moments.
The circular puck in the center of the Nav-Mat II is for attaching your GPS device's or smartphone's suction-cup car kit. By mounting on the dash instead of the windshield, the device is now closer to the driver and compliant with nearly all windshield obstruction laws.