The design for the Northwestern Quarter of the Earth is based upon a style in tribute to Whitney Smith, the founder of vexillology. The Northwestern Quarter is where the Northern and Western Hemispheres overlap. The dart or chevron design, as proposed for the flag of Guyana, was Smith's original concept.
However the colour scheme stems from ancient Chinese Cosmology. Accordingly, black is associated with the North and white is associated with West. Yellow is also included, since it acts as the reference point from the center.
This flag can be flown over any area of the Earth in the Northwestern Quarter- which includes the USA, Canada, Mexico, all of the Caribbean, and the part of South America north of the Equator.