1. Degrees, Minutes, Seconds (DMS)
2. Degrees, Minutes as decimal (DM.m)
3. Numerical
d        Degrees
dd      Degrees
ddd    Degrees
M       Minutes

MM   Minutes
s       Seconds
ss     Seconds
D       Direction
Values range from 0 - 180
Two digit values range from 00 - 180
Three digit values range from 000 - 180
Displayed with a decimal component that represents the seconds as a fraction of a  minute,
eg 4 minutes, 15 seconds, displays as 4.25
Two digit values range from 00 - 59
Values range from 0 - 59
Two digit values range from 00 - 59
Displays 'East', or 'West' as appropriate
The earth is a sphere, so how do we describe an exact
position on its surface?

The most common way to locate positions on the  Earth is by
standard geographic coordinates called latitude and longitude.
These coordinates values are measured in degrees and represent
angular distances calculated from the center of the Earth.
Let's imagine the Earth as a giant sphere spinning around an
axis.  The axis runs from the North and South Poles. The
Equator run around the earth, an equal distance from both
poles.  The Equator is the latitude line with a he value of 0
(zero) degrees and is the starting point for measuring latitude.

Lines of longitude (called meridians) run perpendicular to lines
of latitude- and all pass through both poles.   The Earth is
divided equally into 360 degrees of longitude with 180
degrees of longitude to the east of the Prime Meridian;
when
the directional designator is omitted these longitudes are
given
positive values. There are also 180 degrees of
longitude to the west of the Prime Meridian;
when the
directional designator is omitted these longitudes are
given
negative values.
Equator—The line running around the Earth at an equal distance from the
North and South Poles.

Geographic coordinates— Values given as latitude and longitude.

Great circle—A circle formed on the surface of a sphere by a plane that
passes through the center of the sphere.  The Equator, each meridian, and
each other full circumference of the Earth forms a great circle.  The arc of a
great circle is the shortest distance between two points on the Earth's
surface.

Meridian—A great circle around the Earth, passing through the
geographical poles and some third point on the Earth's surface. All points
on a given meridian share the same longitude.

Parallel—A circle or approximation of a circle on the surface of the Earth,
parallel to the Equator and connecting points of equal latitude.

Prime Meridian—The meridian of longitude (zero) 0 degrees, used as the
origin for the measurement of longitude.  The meridian of Greenwich,
England, is the internationally accepted prime meridian.
Degrees of latitude and longitude can be further subdivided into
minutes and seconds: there are 60 minutes (') per degree, and 60
seconds (") per minute. For example, a coordinate might be written
65° 32' 15". Degrees can also be expressed as decimals: 65.5375,
degrees and decimal minutes: 65° 32.25', or even degrees, minutes,
and decimal seconds: 65° 32' 15.275".

One degree of latitude is approximately 69 miles, and a minute of
latitude is approximately 1.15 miles. A second of latitude is
approximately 0.02 miles, or just over 100 feet.

One degree of longitude varies in size.  At the equator, it is
approximately 69 miles.  The size decreases to zero as the meridians
meet at the poles.  At a 45 degrees latitude,  a degree of longitude is
approximately 49 miles.
 Commonly Used Terms
There are Three basic ways
to display your coordinates:
 DecimalDegrees Minutes Numerical
 Degrees, Minutes,Seconds
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