View Full Version : map math not working out
lou19604
07-29-2010, 18:07
A) 75 52'30" to B) 75 37'30" = 15'
[ C) 1' being 1.2 miles ]
[ D)map scale 1 1/4" equals 1 mile]
16 11/16" between boints A and B
Based on C miles should be 18
Based off of D mileage is 13 miles and change
using a USGS TOPO MAP 50,000
where am i going wrong ????
C is wrong, that is about right for latitude, or longitude at the equator, but this far north of the equator it is more like .82 miles per minute of longitude, which works out to 12.3 miles for 15'.
lou19604
07-29-2010, 22:32
So if 1min of degree is .82 miles then 1'= 4329.6 feet
4329.6 divide 60 (to determine sec) would be 72.16 feet on 1"
The Old Fhart
07-29-2010, 23:11
lou19604, Using the Turkey Hill Minit Market on St. Lawrence Ave in Reading as one of the points, I get the distance of 15'=13.201 miles, so The Tank's guesstimate is a good one. I would use the FizzyCalc downloadable calculator (http://www.fizzymagic.net/Geocaching/FizzyCalc/)that can handle coordinate conversions, distance, projections, and several other function with great accuracy for your calculations.