NCEP.Airspeed           Calculate flow-assistance according to equation
                        'Airspeed'
NCEP.FlowSpeed          Calculate flow-assistance according to equation
                        'FlowSpeed'
NCEP.Groundspeed        Calculate flow-assistance according to equation
                        'Groundspeed'
NCEP.M.Groundspeed      Calculate flow-assistance according to equation
                        'M.Groundspeed'
NCEP.NegFlowSpeed       Calculate flow-assistance according to equation
                        'NegFlowSpeed'
NCEP.PartialSpeed       Calculate flow-assistance according to equation
                        'PartialSpeed'
NCEP.Tailwind           Calculate flow-assistance according to equation
                        'Tailwind'
NCEP.aggregate          Temporally Aggregate Weather Data
NCEP.array2df           Convert data from an array to a data frame
NCEP.bind               Bind Two 3-D Arrays of Weather Data Along the
                        Prime Meridian
NCEP.flight             Simulate Trajectories
NCEP.gather             Queries Weather Data
NCEP.interp             Interpolates Weather Data to a point in space
                        and time
NCEP.loxodrome          Calculate the loxodrome angle between two
                        points on Earth.
NCEP.restrict           Temporally Filters Weather Data
NCEP.track2kml          Plot a track in Google Earth
NCEP.uv.revert          Reverts speed and direction to U and V
                        components.
NCEP.vis.area           Visualize Weather Data on a Map
NCEP.vis.points         Visualize Weather Data Interpolated to a Point
                        on a Map
RNCEP-package           This package of functions retrieves, organizes,
                        and visualizes weather data from either the
                        NCEP/NCAR Reanalysis or NCEP/DOE Reanalysis II
                        datasets
gull                    GPS data points from a lesser black-backed gull
