nautical mile distance calculator

[bgreen]

Hello,

Does anyone know if there is such a thing as a nautical mile/knot distance calculator. For example, I was wondering if there is a way to calculate the nautical distance between two sets of coordinates.

Any assistance is appreciated,

regards

Bob

[SAsurfa]

Here you go bgreen..

http://jan.ucc.nau.edu/~cvm/latlongdist.html

Just read the notes on how to enter the lats and longs.

Also if you have Google Earth you can just open the ruler tool and draw a line between your two points and get a distance in whatever unit you may need. Much easier

[Donweather]

If you want to write your own spreadsheet with calculations rather than using the internet, I use this formula for the great circle distance between two points

ACOS(SIN(Lat1)*SIN(Lat2)+COS(Lat1)*COS(Lat2)*COS(Long1-Long2))*6372.795

Note:
Input Latitudes and Longitudes must be converted to radians as opposed to degrees
Result is in km

[LONGINUS]

^^^old skool there Don!

Always found a chart and a pair of dividers to be the easiest way personally, just be careful near the poles when using a mercator projection. It would have been so much simpler if this planet was perfectly round instead of an inconvenient oblate spheroid

[Donweather]

What can I say Longi!!! I'm an engineer and love formulas mate!!!

And I don't generally use it near the poles as there's usually ice shelfs there that kinda don't generate swell!!!

[bgreen]

Thanks all. Great suggestions. I have been trying to learn a stats program called R and have now a function that does all this and developed a spreadsheet of coordinates for the east coast (mainly) which I can then use to measure distances to a weather system.

Thanks again,

bob