If my trusty weather radio tells me the winds are a certain mph , how do I make that mathmatetical conversion ? Regards, Mike
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Every thing you want to know but are afraid to ask
Look up this web site. They convert it for you. www.ncf.ca/boating/convertspeed.html
Look up this web site. They convert it for you. www.ncf.ca/boating/convertspeed.html
Nautical Miles
A statute mile is 5,280 feet. 1 knot is 1 nautical mile per hour. A nautical mile is 6076.115 feet (approximately, according to Compton's dictionary). To convert miles to knots: 5,280 divided by 6076.115 = 0.868976 times the number of miles To convert knots to miles: 6076.115 divided by 5280 = 1.150779356 time the number of nautical miles
A statute mile is 5,280 feet. 1 knot is 1 nautical mile per hour. A nautical mile is 6076.115 feet (approximately, according to Compton's dictionary). To convert miles to knots: 5,280 divided by 6076.115 = 0.868976 times the number of miles To convert knots to miles: 6076.115 divided by 5280 = 1.150779356 time the number of nautical miles
My turn.....
A nautical mile is a unit of distance equal to 1,852 metres. This value was adopted by the International Hydrographic Conference in 1929 and has subsequently been adopted by the International Bureau of Weights and Measures. The length of the nautical mile is very close to the mean value of the length of 1 minute of latitude, which varies from approximately 1,843 metres at the equator to 1,861.6 metres at the pole.
A nautical mile is a unit of distance equal to 1,852 metres. This value was adopted by the International Hydrographic Conference in 1929 and has subsequently been adopted by the International Bureau of Weights and Measures. The length of the nautical mile is very close to the mean value of the length of 1 minute of latitude, which varies from approximately 1,843 metres at the equator to 1,861.6 metres at the pole.
Easy conversion, No calculators required
MPH - .1 MPH aproximatly Knots. Within 3.5%. Good enough for wind speed. Mph minus a tenth of the value. For 100 Statute miles you would estimate 90 Nautical Miles while the answer is almost 87 Nautical Miles. (86.97) Bill
MPH - .1 MPH aproximatly Knots. Within 3.5%. Good enough for wind speed. Mph minus a tenth of the value. For 100 Statute miles you would estimate 90 Nautical Miles while the answer is almost 87 Nautical Miles. (86.97) Bill
hLatitude varies?
I had thought that a nautical mile was exactly 1 minute of 1 degree of latitude. I had also thought that the distance between degrees of latitude were constant as being concentric circles. Can anyone explain why is a degree of latitude shorter at the equator than near the pole?
I had thought that a nautical mile was exactly 1 minute of 1 degree of latitude. I had also thought that the distance between degrees of latitude were constant as being concentric circles. Can anyone explain why is a degree of latitude shorter at the equator than near the pole?
Do you still believe the earth is a sphere??
In case you have not heard, the earth in fact is an "oblate spheroid." Not enough different from a spherre that you would notice doing navigation. Or looking at it from space. But it does change the surface distance between degrees of latitude .. out in the fourth significant digit. (The degrees latitude are angular measures of solid geometry, from the center of the earth. They must be this, for the sake of celestial calculations. Far better that the distance between degrees varies a bit twixt pole and equator, than that degrees declination are different from the degrees used to measure latitude! Nay, let's have 360 even degrees in the circle, and 180 from pole to pole, evenly angled, even if our surface is not a perfect sphere. What's that, you say? Our space isn't Euclidean! Let's not mention it.)
In case you have not heard, the earth in fact is an "oblate spheroid." Not enough different from a spherre that you would notice doing navigation. Or looking at it from space. But it does change the surface distance between degrees of latitude .. out in the fourth significant digit. (The degrees latitude are angular measures of solid geometry, from the center of the earth. They must be this, for the sake of celestial calculations. Far better that the distance between degrees varies a bit twixt pole and equator, than that degrees declination are different from the degrees used to measure latitude! Nay, let's have 360 even degrees in the circle, and 180 from pole to pole, evenly angled, even if our surface is not a perfect sphere. What's that, you say? Our space isn't Euclidean! Let's not mention it.)
Thanks for the lesson
I can see I've got a little work to do before I feel qualified for celestial navigation.
I can see I've got a little work to do before I feel qualified for celestial navigation.
Greg, That's a pretty big pole...
1,861 meters at the pole???? 1,861 meters times 360 degrees times 60 minutes/degree makes the circumference over 40,000 kilometers. That's a BIG pole, whether it is a magnetic pole, true (north/south axis) pole, or barber pole! <G>
1,861 meters at the pole???? 1,861 meters times 360 degrees times 60 minutes/degree makes the circumference over 40,000 kilometers. That's a BIG pole, whether it is a magnetic pole, true (north/south axis) pole, or barber pole! <G>
Change the setting on your GPS
All of us have it easy. Just remember that a nautical mile is approx 1.1 standard miles and that will get you close to the dock. Multiply miles by 1.1 or divide knots by 1.1 to go the other way. Have a good time.
All of us have it easy. Just remember that a nautical mile is approx 1.1 standard miles and that will get you close to the dock. Multiply miles by 1.1 or divide knots by 1.1 to go the other way. Have a good time.
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