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Knots being phased out?
krj wrote: Capt. JG wrote: "krj" wrote in message . .. Peter Bennett wrote: On Fri, 01 Dec 2006 14:12:52 GMT, keith_nuttle wrote: Since the nautical mile is defined as one minute of latitude, I doubt it will ever disappear in earth based navigation. The Nautical Mile was originally based on a minute of latitude, but the length of a minute of latitude varies with latitude, so an International Nautical Mile is now defined as 1852 metres exactly, or 6076.11549 US feet, approximately, according to Bowditch. I believe that the nautical mile is based on the minute of LONGITUDE not latitude. Longitude doesn't vary with changes in latitude (or attitude). That's why when you are using paper charts (remember those) you measure the distance with your dividers on the longitude scale on the east or west side of the chart. krj Where do you guys get this?? You have it 180 degrees backward. Or, is this a troll? :-) http://powerboat.about.com/od/forms_..._Longitude.htm Ooops, I did get it backwards krj sorry, didn't see this post from you until after I replied. |
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