.CalcLegendre           Compute Associated Legendre Functions Given
                        Sequence of (degree, order) Indices
.CalcLegendreComponents
                        Compute Legendre Components
.CalcPolynomialComponents
                        Calculate Polynomial Components for Associated
                        Legendre Function
.CalculateGaussCoef     Lookup Table for Gauss coefficients g & h
.CalculateGeocentricFieldSum
                        Calculate sum of geocentric field components
.CalculateMagneticElements
                        Calculate Expected Magnetic Elements from
                        WMM2020
.CalculateMagneticField
                        Calculate Expected Magnetic Field from WMM2020
.CalculateRadiusCurvature
                        Radius of curvature of prime vertical
.CheckBlackoutZone      Check if given horizontal intensity triggers a
                        blackout zone
.CheckVersionWMM        Check if given time is consistent with
                        available WMM versions
.ConvertGeocentricToGeodeticFieldComponents
                        Geocentric Coordinates to Geodetic Coordinates
.ConvertGeodeticToGeocentricGPS
                        Convert from Geodetic to Geocentric Coordinates
.DeriveVersionInfo      Derive WMM version based on given time
GetMagneticFieldWMM     Calculate Expected Magnetic Field from WMM
wmm                     wmm: R Implementation of World Magnetic Model
