Graphics from Charlie Leonard (Boise Interagency Dispatch Center, Boise Id.) powerpoint presentation (INTROGPS Used without permission
10º
20º N
10º N 0º N
10º S
10º 690 miles 10º 690 miles
10º 690 miles
powerpoint presentation (INTROGPS).
10º
690 miles
690 miles
690 miles
Graphics from Charlie Leonard (Boise Interage Used without permission
10º
240 mi 460 miles
690 miles
120º W
from Charlie Leonard (Boise Interagency Dispatch Center, Boise Id.) powerpoint presentation (INTROGPS). out permission
10º 240 mi
10º 460 miles
10º 690 miles
0º W
110º W
Cheatsheet for GPS implication of position Necessary Conversions 1 Nautical Mile = 6076.12 feet 1 Nautical Mile = 1852 meters
WORK IN PROGRESS: Use at your own discretion. Worksheet: Some interesting conversions and stats. 6076.12 Enter your Latitude and see what the coordinates 1852 imply in terms of "on ground distance"
Formulas and Examples
LATITUDE - No matter where you are on the planet, these distances apply!
One Degree of Latitude = 60 Nautical Mile = 364,567.2 feet = 111,120 meters One Minute of Latitude = 1 Nautical Mile = 6076.12 feet = 1852 meters One Second of Latitude = 0.016666 Nautical Miles = 101.27 feet = 30.87meters
LONGITUDE - the "on earth" distance of a unit of Longitude along a parallel depends on the latitude of that parallel
One Degree of Longitude corresponds to 111,120 meters multiplied by the cosine of the latitude One minute of Longitude corresponds to 1852 meters multiplied by the cosine of the latitude One second of Longitude corresponds to 30.86666 meters multiplied by the cosine of the latitude For Anchorage at 62 degrees N latitude this corresponds to 111,120*(cos(62)) = 52167.68 meters For Anchorage at 62 degrees N latitude this corresponds to 1852*(cos(62)) = 869.46 meters For Anchorage at 62 degrees N latitude this corresponds to 30.866*(cos(62)) = 14.49 meters
Therefore a Screen reading on a PLGR carried out to 1 hundredth of a second for Longitude(eg. 149 23 43.33) = Therefore a Screen reading on a PLGR carried out to 1 hundredth of a second for Latitude(eg. 62 23 12.33) = In Meters 0.005 0.011 0.470 1.111
Meters 0.13 In East West 0.31 In North South
A PLGR screen reading out to 7 decimal places(Longitude) = A PLGR screen reading out to 7 decimal places(Latitude) = A GPS screen reading out to 5 decimal places(Longitude) = A GPS screen reading out to 5 decimal places(Latitude) =
In East West In North South In East West In North South Latitude A degree of Latitude in your area implies=>> A Minute of Latitude in your area implies=>> A Second of Latitude in your area implies=>>
Enter your Latitude as a Degree here=>
Longitude A degree of Longitude in your area implies=>> A Minute of Longitude in your area implies=>> A Second of Longitude in your area implies=>>
65 In Meters In Feet 46961.34 154072.65 782.69 2567.88 13.04 42.80
ns and stats. ordinates
NorthSouth In Meters In Feet 111120.00 33869.37 1852.00 564.49 30.87 9.41