It's a common problem: Reading the Navigator display in strong sunlight is often difficult, if not impossible. Wunderlich recognized the problem and created a relatively simple but highly effective solution. This visor is made of strong ABS plastic and it simply snaps onto the Navigator, allowing much improved visibility, even in strong sunlight situations.
K1600 Owners! Please note if your Nav 5 is mounted in the dash this part will NOT work as it will not be able to snap properly behind the bracket.