Topic Author
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Diffrent Miles

Thu Apr 12, 2001 6:42 am

What is the diffrence between nautical mile,salute mile, and miles like in a car?

RE: Diffrent Miles

Thu Apr 12, 2001 6:49 am

A nautical mile is 1.150717703 statute mile, statute mile and car mile are the same.
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RE: Diffrent Miles

Thu Apr 12, 2001 6:56 am

1 nautical mile equals 6076.1 feet
1 statute mile equals 5280 feet

1.15 is the usual conversion factor................

statute miles X 1.15 = nautical miles
nautical miles / 1.15 = statute miles

A nautical mile equals 1 minute of latitude.

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RE: Diffrent Miles

Thu Apr 12, 2001 7:27 am

Please correct me if I am wrong

My understanding is 1nm = 1minute of latitude at equator.

Thanks in advance.
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RE: Diffrent Miles

Thu Apr 12, 2001 7:41 am

thats correct mandargh.
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Topic Author
Posts: 257
Joined: Mon Mar 05, 2001 5:03 am

RE: Diffrent Miles

Thu Apr 12, 2001 8:53 am

Thanks for the responses

RE: Diffrent Miles

Fri Apr 13, 2001 4:54 am

Mandargb asked:"Please correct me if I am wrong
My understanding is 1nm = 1minute of latitude at equator. "

Mandargb, you are not wrong in stating that. But if you are implying that it's only true at the equator, then that's not entirely true. 1nm is equal to 1 minute of latitude everywhere on earth since latitude lines are all parallel to each other. For longitudes 1minute = 1 nm multiplied with the cosine of latitude since longitudinal lines gets closer (smaller) and meet at the two poles. In this case, 1 min = 1 nautical mile for longitude only at the equator. Anywhere else it is less by cosine of the latitude.


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RE: Diffrent Miles

Fri Apr 13, 2001 7:13 am

Hi guys-

The fully correct defenition of the NM as introduced by the Royal Navy well before Columbus had set sail for America is:
The length of one minute measured along a MERIDIAN.
Since we can consider the world to be almost a sphere, you may also say EQUATOR, although this is not 100% correct!
In fact, because our earth is not a perfect sphere but is somewhat flatted at the poles due to earth rotation, if you use the EQUATOR in your defenition your NM will be slightly longer: 1.4% to be precise!

I hope this resolved a wellspread misconception.

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RE: Diffrent Miles

Fri Apr 13, 2001 10:55 am

Actually a minute of latitude is about 1% shorter at the equator than it is at the poles.

Since the earth isn't spherical there have been various nautical miles in the past, but the official definition is now 1852 meters. A statute mile is exactly 1609.344 meters, so that makes the conversion factor about 1.150779.
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RE: Diffrent Miles

Tue Apr 17, 2001 6:50 am

Ok, to be exact:

A Nautical mile at any place is the length of an arc of the Meridian subtending to an angle of 1' at the centre of curvature of the place.

at the poles: 6107.8 ft.
at the equator: 6046.4 ft
standard: 6080 ft or 1852m. this is called the Standard or Universal Nautical mile

so what Sabenapilot says is not exactly true, even on the merideans, we have a difference due to the compression of the earth.

one tenth of a nautical mile is called 1 cable
In the USA, the length of a nautical mile is measured as 6076.1 ft. this is called the International Nautical mile.

one statute mile is 1609m


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