Imperial Miles or Nautical Miles?

[max-peck]

OK - so I have to launch my TLAMS within 100 miles of the target for the game to register this a a successful mission

Anyone know if this is Imperial Miles or Nautical miles?

I am going to go with Imperial Miles today just to be sure (it is a shorter distance - 176000 Yards)

But it would be nice to know

EDIT
The title of this thread should say Statute Mile not Imperial Mile
Apparently there is no such thing as an Imperial Mile
You can have either a Statute Mile or a Nautical Mile
Go Figure

[max-peck]

PS
It would be nice to be able to draw a circle from the target area with a 100 mile radius

[Shadriss]

For all nautical applications, including TLAM/TASM, Nm is the correct version to use. The US may use imperial, the rest of the world metric, but on the sea, we have apparently all agreed on something for once, and that is the nautical mile.

[max-peck]

Originally Posted by Shadriss

For all nautical applications, including TLAM/TASM, Nm is the correct version to use. The US may use imperial, the rest of the world metric, but on the sea, we have apparently all agreed on something for once, and that is the nautical mile.

Oh yeah - I completely agree with you
All the ships on the seven seas have agreed on the Nautical Mile being the standard unit of measurement - and use knots as a common unit of measuring speed

As an aside - this makes total sense to me - 1nm equals one minute of latitude - that totally makes sense to me as a unit of measurement
Much more sense than a statute mile, which seems to be based upon furlongs
Or possibly Rods (A 14th Century Surveyors unit of measurement)
Or again possibly the distance a Roman Legion would cover in 1000 paces

(And if you want to know more about the development of our units of measurement, please Wiki it - it just gets more confusing the more you delve into it . But this is the kind of stuff I find really interesting)

What I am actually asking is if we actually know whether the game uses Statute Miles or Nautical Miles

The difference between the two is 26537 yards - so this could be very important
The difference between getting a mission success or a mission failure

[Shadriss]

Originally Posted by max-peck

What I am actually asking is if we actually know whether the game uses Statute Miles or Nautical Miles

The difference between the two is 26537 yards - so this could be very important
The difference between getting a mission success or a mission failure

Uhm... your numbers are off. Way off. A statue mile is 5280 feet (1760 yds) and a nautical mile is 5802 feet (1934 yds). Certainly not a difference of 26.5 Kyds.

That said, my answer doesn't change - if everyone uses knots and Nm at sea, then the game uses the same system.

[max-peck]

Originally Posted by Shadriss

Uhm... your numbers are off. Way off. A statue mile is 5280 feet (1760 yds) and a nautical mile is 5802 feet (1934 yds). Certainly not a difference of 26.5 Kyds.

That said, my answer doesn't change - if everyone uses knots and Nm at sea, then the game uses the same system.

The difference between 100 nm and 100 statute miles is 26537 yards I believe

Sorry I didn't make that clear

[Shadriss]

Originally Posted by max-peck

The difference between 100 nm and 100 statute miles is 26537 yards I believe

Sorry I didn't make that clear

Normally, I'd give the age-old quote "Meh... ADCAP will suck it up." But since you are likely referring to TLAM/TASMs, I'll adjust. "Meh... missile will suck it up."

[asrosser]

I found launching from 200Kyards (100 nm) get's you a fail but 1700Kyards ( 100 statute miles) get's you a mission accomplished.

[Capt Jack Harkness]

Originally Posted by max-peck

As an aside - this makes total sense to me - 1nm equals one minute of latitude - that totally makes sense to me as a unit of measurement

Close, according to this http://www.coastalnavigation.com/sam..._pages/1_2.htm it's one arc second, not minute.

Originally Posted by Shadriss

Uhm... your numbers are off. Way off. A statue mile is 5280 feet (1760 yds) and a nautical mile is 5802 feet (1934 yds). Certainly not a difference of 26.5 Kyds.

According to the same source 1 nm is 6076 feet. Either way, that difference is why knots are faster than mph.

[Lanzfeld]

Originally Posted by Shadriss

Uhm... your numbers are off. Way off. A statue mile is 5280 feet (1760 yds) and a nautical mile is 5802 feet (1934 yds). Certainly not a difference of 26.5 Kyds.

That said, my answer doesn't change - if everyone uses knots and Nm at sea, then the game uses the same system.

Nope.
A nautical mile is 6076 feet.

[Sean C]

Originally Posted by Capt Jack Harkness

Close, according to this http://www.coastalnavigation.com/sam..._pages/1_2.htm it's one arc second, not minute.

Actually, it says the opposite...which is correct.

Originally Posted by coastalnavigation.com

One minute of latitude equals one nautical mile and degrees of latitude are 60 nm apart.

Degrees of longitude are also 60nm apart at the Equator. Differences in longitude further away from the Equator can be approximated by dividing the distance in nm by the cosine of the latitude. For instance:

60nm ÷ cos(45) = 84.85

...so at 45° latitude, 60nm equals about 84'51" of longitude. (Or 1°24'51".)

[Shadriss]

Originally Posted by Lanzfeld

Nope.
A nautical mile is 6076 feet.

Originally Posted by Capt Jack Harkness

According to the same source 1 nm is 6076 feet. Either way, that difference is why knots are faster than mph.

I stand corrected - I was using a correction factor from my sonar equations, which uses a constant of 1934 to correct from ft per second into yards, and not feet into yards. Either way though, my original statement stands (minus the actual distance itself).

[FPSchazly]

According to Wikipedia, the nautical mile's derivation used to be one minute of latitude, but it's now an SI-derived unit exactly equal to 1852 m.

Also, my knit-picking about how to abbreviate nautical miles is going to come full swing here: "the symbols M, NM, Nm, and nmi are all used" to represent nautical miles. Please note that nm is nanometers! and not nautical miles /endrant

(yes I know that I probably know what you're talking about when you use "nm" but it's a big difference in terms of distance)

[Sean C]

1,852 meters is the International Nautical Mile. Quoting Bowditch:

Originally Posted by The American Practical Navigator

Because of various lengths of the nautical mile in use throughout the world, due to differences in definition and the assumed size and shape of the earth, the International Hydrographic Bureau in 1929 proposed a standard length of 1,852 meters, which is known as the International Nautical Mile. This has been adopted by nearly all maritime nations.

However:

Originally Posted by The American Practical Navigator

For practical consideration it is usually considered the length of 1 minute of any great circle of the earth, the meridian being the great circle most commonly used.

I can tell you that most navigators I have corresponded with and most texts on navigation I have read (which is more than a few, in both cases) treat the nautical mile as equal to 1 arc minute of a great circle. It's the most convenient and natural option when it comes to practical navigation.

Most navigators also use the abbreviation "nm". When we're talking about navigation, no one gets confused. As one friend put it:

From a practical standpoint, it occurs to me that anyone likely to mistake the two in a given context probably shouldn't be on the water in the first place.

[FPSchazly]

Haha yes that's a fair assumption to make. Just be careful if you start talking about computer processors out there, too