4 ms·

Right, I only meant that the metric system is not used. But I'm confused. Are feet and NM not part of the standard Imperial units of measure?

pacificmint 3y ago
An imperial mile is 1,609 meters. A nautical mile is 1,852 meters.
eCa 3y ago
Nautical miles are globally used and are older than the imperial units by a couple of hundred years[1]. [1] https://en.wikipedia.org/wiki/Nautical_mile https://en.wikipedia.org/wiki/Nautical_mile
chungy 3y ago
Feet, nautical miles, statutory miles, and meters are all part of the United States Customary Units. "Imperial units" is ambiguous and can refer to many different sets of units all sharing the same name. US Customary units use SI as a baseline for measuring based on physical constants, and standardized conversions from them to units very similar to what was conventional. Eg, since the meter is defined by the distance light travels in a vacuum for the duration of 1/299,792,458 second, and the US defines an inch to be exactly 2.54 cm, any refinement to the speed of light inherently changes the length of an inch. 12 inches equals a foot, a mile equals 5280 feet (exactly 1609.344 meters), and all these things are based on physical constants. Nautical miles are defined as exactly 1852 meters, which is approximately 1.15 miles.
- remarkEon 3y ago
  That's my bad for not being clear.
addaon 3y ago
Just like "metric" can refer to CGS or MKS, "imperial" can refer to... well, whatever you want. But usually in the US when we say "imperial", we mean statute miles as the mile unit, not nautical miles.
stergios 3y ago
"Pounds of fuel" are used when, after declaring an inflight emergency, ATC requests information for on ground fire rescue along with number of souls on board.
shiroiuma 3y ago
>Are feet and NM not part of the standard Imperial units of measure? In addition to the other replies you're getting here, the US for instance does not use imperial units, despite what many people on the internet believe. Imperial units are used by the UK (hence the term "imperial"). The US uses "US customary units", which sometimes overlap with UK units, and other times have the same name but are different. An imperial gallon is quite different from a US gallon, for instance, but imperial and US inches are the same.

pacificmint 3y ago

An imperial mile is 1,609 meters. A nautical mile is 1,852 meters.

eCa 3y ago

Nautical miles are globally used and are older than the imperial units by a couple of hundred years[1]. [1] https://en.wikipedia.org/wiki/Nautical_mile https://en.wikipedia.org/wiki/Nautical_mile

chungy 3y ago

Feet, nautical miles, statutory miles, and meters are all part of the United States Customary Units. "Imperial units" is ambiguous and can refer to many different sets of units all sharing the same name. US Customary units use SI as a baseline for measuring based on physical constants, and standardized conversions from them to units very similar to what was conventional. Eg, since the meter is defined by the distance light travels in a vacuum for the duration of 1/299,792,458 second, and the US defines an inch to be exactly 2.54 cm, any refinement to the speed of light inherently changes the length of an inch. 12 inches equals a foot, a mile equals 5280 feet (exactly 1609.344 meters), and all these things are based on physical constants. Nautical miles are defined as exactly 1852 meters, which is approximately 1.15 miles.

remarkEon 3y ago
That's my bad for not being clear.

addaon 3y ago

Just like "metric" can refer to CGS or MKS, "imperial" can refer to... well, whatever you want. But usually in the US when we say "imperial", we mean statute miles as the mile unit, not nautical miles.

stergios 3y ago

"Pounds of fuel" are used when, after declaring an inflight emergency, ATC requests information for on ground fire rescue along with number of souls on board.

shiroiuma 3y ago

>Are feet and NM not part of the standard Imperial units of measure? In addition to the other replies you're getting here, the US for instance does not use imperial units, despite what many people on the internet believe. Imperial units are used by the UK (hence the term "imperial"). The US uses "US customary units", which sometimes overlap with UK units, and other times have the same name but are different. An imperial gallon is quite different from a US gallon, for instance, but imperial and US inches are the same.