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Offline dr.dtector
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« Reply #10 on: February 07, 2007, 07:46:02 pm »
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Quote:Posted by gadget1961
Thanks no just kidding  im kidding,,,   OK   now this is for mapsource topo maps , what is the difference between minutes and seconds on this map as you can use a variety of ways to read it

MAPSOURCE..YOU MUST HAVE HAND HELD GARMIN.SOMETIMES I AM RETARDED & I THINK THIS IS ONE OF THOSE TIMES..
THE DIFF. BETWEEN MINUTE & SEC IS 59 SECONDS..I'M NOT ANSWERING YOUR QUESTION I KNOW BUT I DONT KNOW WHAT YOUR REAL QUESTION IS YET.. Huh?

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« Reply #11 on: February 07, 2007, 10:22:27 pm »
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Quote:Posted by gadget1961
hi i have a question , what is the difference of the degree of when you read a map as the lat and long of feet and the difference of reading in seconds how close of a distance is it to pinpointing by useing your gps unit for measurement and how close of a reading is it in a area  ex: is it a 10 ft area or 20 ft area difference . thanks  hope you can understand what im asking  this is for cach hunting from a map for map dowsing


A degree of latitude is 60 nautical miles, or 69.04 statute miles. A minute of latitude is equal to one nautical mile, or 6076 feet; thus, a second of latitude (6076 divided by 60) is 101 feet, 3 inches. Conceptually and practically, latitude is the same no matter where you go on earth; however, in reality it varies from 69.41 statute miles per minute at the poles to 68.70 statute miles per minute at the equator due to the earth bulging slightly from its rotational spin.

Longitude, of course, varies in length according to degree of latitude. The following is a sampling of longitude lengths for selected latitudes, beginning in the southern US and working north.

30 degrees North, (approximately Houston, Texas) a degree of longitude is 59.96 statute miles, 5274 feet per minute (almost equal to a statute mile), 88 feet per second.

35 degrees North, (approximately Albuquerque, New Mexico) a degree of longitude is 56.73 statute miles, 4992 feet per minute, 83.2 feet per second.

40 degrees North, (Kansas/Nebraska border), a degree of longitude is 53.06 statute miles, 4669 feet per minute, 77.8 feet per second.

45 degrees North, (Montana/Wyoming border), a degree of longitude is 49.00 statute miles, 4312 feet per minute, 71.87 feet per second.

49 degrees North (US/Canada national boundary), a degree of longitude is 45.40 statute miles, 3995 feet per minute, 66.59 feet per second.

50 degrees North (approximately Powell River, BC, Medicine Hat, Alberta, and Winnipeg, Manitoba), a minute of longitude is 44.55 statue miles, 3920 feet (1195 meters) per minute, 65.34 feet (19.9 meters) per second.

55 degrees North (approximately Ketchikan, Alaska and Dawson Creek, BC) a degree of longitude is 39.77 statute miles, 3500 feet (1066.8 meters) per minute, 58.33 (17.78 meters) per second.

Finally, 60 degrees North (southern border of the Northwest Territories), a degree of longitude is 34.67 statute miles, 3051 feet (930 meters) per minute, 50.85 feet (15.5 meters) per second.

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« Last Edit: February 07, 2007, 10:24:49 pm by oRo »
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Offline dr.dtector
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« Reply #12 on: February 08, 2007, 06:05:55 am »
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superb info as per oro..but lets not forget factoring in & calculating the curvature of earth if distance requires..
this essential calc if not included could mean the diff. between yes & no Grin

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« Last Edit: February 08, 2007, 06:09:13 am by dr.dtector »
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« Reply #13 on: February 08, 2007, 09:53:03 am »
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Welcome to our forum Brittanicus. Thanx for the insight and stuff too. Hope to see you communicate with some of us here in these threads, on this post (#1)  that you started. We welcome another one of your posts sometime in the future. Smiley


Oh ya, all that other stuff, I didn't know Jack about. Well, now, after all the above threads and everything, I  feel like I now know even less.  Sad  Sorry for being such a blank folks.  Huh? See Doc, I knowd I shuda went to proper school and learned more importent s__t! Grin

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« Reply #14 on: February 08, 2007, 11:22:37 am »
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no school required..simple desire or need only Embarrassed

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« Reply #15 on: February 09, 2007, 12:04:16 pm »
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Quote:Posted by oRo
Quote:Posted by gadget1961
hi i have a question , what is the difference of the degree of when you read a map as the lat and long of feet and the difference of reading in seconds how close of a distance is it to pinpointing by useing your gps unit for measurement and how close of a reading is it in a area  ex: is it a 10 ft area or 20 ft area difference . thanks  hope you can understand what im asking  this is for cach hunting from a map for map dowsing


A degree of latitude is 60 nautical miles, or 69.04 statute miles. A minute of latitude is equal to one nautical mile, or 6076 feet; thus, a second of latitude (6076 divided by 60) is 101 feet, 3 inches. Conceptually and practically, latitude is the same no matter where you go on earth; however, in reality it varies from 69.41 statute miles per minute at the poles to 68.70 statute miles per minute at the equator due to the earth bulging slightly from its rotational spin.

Longitude, of course, varies in length according to degree of latitude. The following is a sampling of longitude lengths for selected latitudes, beginning in the southern US and working north.

30 degrees North, (approximately Houston, Texas) a degree of longitude is 59.96 statute miles, 5274 feet per minute (almost equal to a statute mile), 88 feet per second.

35 degrees North, (approximately Albuquerque, New Mexico) a degree of longitude is 56.73 statute miles, 4992 feet per minute, 83.2 feet per second.

40 degrees North, (Kansas/Nebraska border), a degree of longitude is 53.06 statute miles, 4669 feet per minute, 77.8 feet per second.

45 degrees North, (Montana/Wyoming border), a degree of longitude is 49.00 statute miles, 4312 feet per minute, 71.87 feet per second.

49 degrees North (US/Canada national boundary), a degree of longitude is 45.40 statute miles, 3995 feet per minute, 66.59 feet per second.

50 degrees North (approximately Powell River, BC, Medicine Hat, Alberta, and Winnipeg, Manitoba), a minute of longitude is 44.55 statue miles, 3920 feet (1195 meters) per minute, 65.34 feet (19.9 meters) per second.

55 degrees North (approximately Ketchikan, Alaska and Dawson Creek, BC) a degree of longitude is 39.77 statute miles, 3500 feet (1066.8 meters) per minute, 58.33 (17.78 meters) per second.

Finally, 60 degrees North (southern border of the Northwest Territories), a degree of longitude is 34.67 statute miles, 3051 feet (930 meters) per minute, 50.85 feet (15.5 meters) per second.

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Great post oRo and nice link.  Thanks for the info.

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