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Instructions provided describe how to calculate Decimal Degrees from Degrees Minutes Seconds (DMS) manually.
Decimal Degrees =
Degrees + ((Minutes / 60) + (Seconds / 3600))
DMS: 75 59 32.483 W
Decimal degrees: -75.9923564
Degrees Minutes Seconds is often followed by the hemisphere labels of N, S, E, or W. When converting to decimal degrees, convert longitude values that are in the western hemisphere or latitude values that are in the southern hemisphere to negative decimal degree values.