World’s biggest cheese grater. World’s biggest BBQ grille. World’s biggest harmonica. Any analogy you come up with for the Navigator’s new front end always is prefaced by “world’s biggest.” Until this year, the Navigator was subdued compared to a Cadillac Escalade, but the huge chrome grille, flanked by massive jeweled headlights and topped with another bar of chrome on the domed hood, bestow upon the Navigator the title, “King of Chrome.” The grille follows the pattern of Lincoln’s latest designs for the new MKX and MKZ, but it upscales horribly to the Navigator, making it look like the SUV has the world’s biggest braces. There’s also a big chrome strip along the side, matching the optional 20-inch chrome wheels.