Why Do Airplanes Measure Distance In Nautical Miles?






A nautical mile (NM) is most commonly associated with traveling through water, as is using knots to determine boat speed. However, both are used in airplanes, too. NMs are used to navigate the open skies and vast oceans because they account for the Earth’s curvature. Once air travel became a reality, the industry quickly discovered that the system sailors used worked just as well for pilots. When Charles Lindbergh successfully used it to navigate his transatlantic flight in 1927, he cemented its future use. Today, they help give pilots a more accurate idea of how much fuel they will consume.

When ancient mariners began spreading out across the globe, they discovered the Earth’s round shape posed a problem for accurately measuring distances. The creation of longitude, latitude, and coordinates fixed that problem. Throughout much of that seafaring history, one nautical mile was only defined as one minute arc of latitude along any line of longitude. In 1929, the First International Extraordinary Hydrographic Conference was held in Monaco, and the NM was set to exactly 1,852 meters, which equated to the rather clumsy distance of 1.151 miles or 6,076 feet. In constrast, a “statute mile” is 5,280 feet.

Longitude and Latitude and nautical miles, oh my!

The nautical mile not only makes flight safer but also supports modern GPS-based navigation. Both the International Civil Aviation Organization (ICAO) and the International Maritime Organization (IMO) require the use of nautical miles as a global standard for ships and aircraft. Interestingly, the U.K. didn’t adopt the international nautical mile until 1970, while the U.S. did so in 1954. If you’re wondering, there’s no such thing as a “nautical kilometer,” as the globally agreed-upon international distance was set using kilometers, not miles, even though the term “mile” is used in the name.

Back in 1947, the ICAO passed a resolution to standardize the unit of measure and even created something called the International System of Units. Based on the metric system, the idea was to phase out the use of “nautical mile” and “knot” (equal to 1 NM/h) in a slow, deliberate manner so as not to rock the boat. Oddly, the system was adopted in 1960 by the 11th General Conference on Weights and Measures (CGPM), but not by the global aviation or naval industries. As of this writing, the nautical mile still wasn’t part of the system. Although “M,” “NM,” “Nm”, and “nmi” have all been used interchangeably over the years, no agreed-upon standard has been established.





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Today, when one pictures a “classic Dodge Charger”, the first image that pops up is almost certainly one of the highly desirable Charger models from the late 1960s or early ’70s. Indeed, those early muscle car Chargers are iconic, playing a starring role in the “Dukes of Hazzard” television show and, somewhat more recently, “The Fast and the Furious” films. But as time ticks on, is it time to start appreciating the modern version of the Charger as a potential modern classic?

It’s now been over 20 years since Dodge brought back the Charger nameplate for a spacious four-door sedan with an optional HEMI V8 engine. While the basic Charger R/T was a potent machine for its time, Dodge really took the Charger’s game to the next level for the 2006 model year with the debut of the Charger SRT8. 

The SRT8 model used a larger version of the third-gen HEMI V8 that, combined with other performance upgrades, transformed the sedan into a serious performance car capable of running with its 1960s HEMI ancestors at the drag strip — to say nothing of its vastly superior handling and refinement. In the years that followed, Dodge would continue to improve the Charger’s performance with larger and more powerful HEMI engines, but the significance of the original Charger SRT8 is not to be overlooked.

A muscle car legend reborn for the 2000s

Today, with the modern Charger being such an established part of the car enthusiast world, it’s easy to forget some of the controversy that surrounded its mid-2000s return. Most of it focused on the fact that the beloved muscle car nameplate had been brought back for a four-door sedan rather than a retro-styled coupe. Fortunately, those people looking for that retro coupe would be satisfied by the reborn Dodge Challenger when it arrived a few years later, while the Charger went on to become a highly popular muscle sedan in its own right.

The addition of the SRT8 model to the lineup certainly helped, of course. Under the hood was the larger 6.1-liter HEMI V8, which differed from the standard 5.7-liter HEMI in several ways, not least the displacement. With the 6.1 under the hood, the SRT8 made 425 hp and 420 lb-ft of torque, easily laying down a mid-13-second quarter-mile time in Motor Trend’s hands. This was very quick by mid-2000s standards, especially considering the now-outdated five-speed automatic transmission.

But the SRT8’s performance went beyond just the drag strip. As part of the SRT transformation, Dodge also gave the car larger wheels and tires, a retuned suspension setup, and large Brembo brakes. While this didn’t necessarily make the car an agile road course weapon, it did give the SRT8 an athleticism that belied the Charger’s weight and size. 

The evolution of modern Dodge muscle

What’s even cooler about this era in Chrysler/Dodge performance history is that the Charger was just one of the four-door LX platform cars that the automaker offered with SRT badges and a powerful HEMI engine under the hood. Apart from the Charger, buyers could also choose from the more upscale, but ultimately short-lived SRT version of the Chrysler 300C sedan or the Dodge Magnum SRT8 station wagon.

The original Charger SRT8 marked the beginning of a long run of increasingly powerful, high-performance models. In the early 2010s, the Charger SRT8’s 6.1 HEMI was replaced by the larger and more powerful 6.4/392 HEMI, with that motor eventually becoming available in the less expensive Charger R/T Scat Pack. Then, of course, came the Charger SRT Hellcat, with a 707-hp, supercharged 6.2-liter that turned the car into a genuine super sedan.

So is the original Charger SRT8 a guaranteed future classic? Classified listings show that clean examples still bring decent money today, but the fact that it was followed by improved models may ultimately limit its potential for becoming a true, mega-desirable collector car. Regardless, though, the Charger SRT8’s accomplishments in modern muscle car history are not to be taken lightly.





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