Calculations with GPS coordinates

The web site which gives the answer would be OK, as well.

Thanks

The top row of numbers is the distance to the East from a vertical line in meters or easting. The bottom row is the distance to the North from a horizontal line, in meters, or northing. Subtract the second easting from the first, subtract the second northing from the first, square each, add them, take the square root to get 383.8 meters, or 1259 feet. I leave off the first 3 or 4 digits since they are the same. I use a scientific calculator to do the math. With my calculator I get 383.8 meters at an angle of 154.7 degrees. On the 1930's plat it's shown as 1245 feet at 158 degrees.

You can take readings over a long time interval and take an average to improve the accuracy.

Ichabod

• UTM

Appreciate your help, Ichabod.

Plus, I hadn't thought of taking several readings to improve the accuracy. Anotherr good tip.

from>Link

When the earth's shape is based on the WGS 84 Ellipsoid:

* The length of 1 degree of latitude is not the same everywhere as it is on the sphere. * At the equator, 1 degree of latitude is 110.57 kilometers (68.7 miles). * At the poles, 1 degree of latitude is 111.69 kilometers (69.4 miles)

The distance represented by a degree of longitude varies upon where it is measured.

* The length of a degree of longitude along a meridian is not constant because of polar flattening. * At the equator, the approximate length is determined by dividing the earth's circumference (24,900 miles) by 360 degrees: 111.05 kilometers (69 miles). * The meridians converge at the poles, and the distance represented by one degree decreases. * At 60� N latitude, one degree of longitude is equal to about 55.52 kilometers (34.5 miles)

• duh