Take current wind data near your location:

Place a dart with such direction in a local map of your area:

Show the direction in a world map with a different geo projection, using a smaller dart:

Get data about the Earth's magnetic field vector at Anchorage:

The horizontal component, declination and negative of the down component form a GeoVector object:

Transform that geo vector to its Cartesian form along the east-north-up axes:

Transform back to cylindrical form:

Draw arrows at random locations over the world, always pointing in the north direction:

Use GeoVectorPlot for a smoother representation:

Get vector field data for 100 random locations over Canada:

They roughly point north, but there is some variability:

Represent the horizontal part of those vectors in a cylindrical projection, for which the y axis points toward true north:

The same vector data at different locations represents different 3D vectors:

Identical vertical vectors at antipodal locations are opposite each other as 3D vectors:

This is an acceleration vector at the location of the Eiffel Tower:

Convert into a vector in the Mercator projection:

Transform back to GeoVector form:

Compare a geo vector and a geodesic starting from the same location with the same azimuth:

Draw the north and east directions at a chosen location, and a vector at that same location: