It's hard to believe just how confusing getting around can be. While advances in mapping and GPS have effectively tackled the difficulties in navigating the labyrinth of freeways, city streets, and suburban boulevards, there remains a much more basic aspect of transportation that can be darn confusing: How we measure it. If you, like most people, don't know a fathom from a furlong, a kilometer from a mile, or mach from a knot, we've done the work for you and provided these handy conversion charts of some popular head-scratch-inducing terms. Give it a few looks and before you know it, you and your ability to rattle off obscure and complex measurements of speed and distance will make you a hit at your next cocktail party.

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