Soil Site 1 , Average Latitude / Longitude Calculations 
Bottomland along White River (Township18 N, Range 12 W, Fractional Sec 19, LBWR) 
Discussion: To find the answer you must average the varied readings and convert the feet to meters of elevation. To average the minutes of latitude and longitude, find the sum of the minutes (or fractional parts thereof) and divide by the number of readings. In a similar manner, average the feet of elevation and multiply by 12 ( to turn it into inches) then divide by 39.34 (inches to meters conversion factor). 
The table below is arranged as a spreadsheet to show the calculations. 
Time (UT) 
Latitude ° North 
Minutes 
Longitude ° West 
Minutes 
Elev (Feet) 
Elev Meters (Feet*12)/39.34 

0:01 
36° 
13.19 
92° 
19.045 
440.00 

0:02 
36° 
13.19 
92° 
19.038 
427.00 

0:03 
36° 
13.197 
92° 
19.032 
393.00 

0:04 
36° 
13.208 
92° 
19.031 
375.00 

0:05 
36° 
13.218 
92° 
19.033 
410.00 

36° 
13.2006 
92° 
19.0358 
409.00 
124.76 

roundoff 
13.20 
19.04 
125 
Norfork Quadrangle Mapsheet approx. elevation 
contour between 380  400 feet above MSL 
In lieu of calculating the elevation, GLOBE now authorizes the use of the approximate value read from the contour lines found on a topographic mapsheet of your location or those found at www.terraserver.com . or www.TopoZone.com , an example for this site is found here.
For this site, the map location is near the center of the page, in the open field between the railroad track and the river, about a centimeter below the dashed red section line. The contour interval is 20 feet. Can you estimate the elevation? How does the estimated elevation compare with the GPS'd elevation?