Eckert VI projection is best used for thematic maps. An example of a thematic map is one depicting land cover.
Meridians are sinusoidal curves that are equally spaced.
Parallels are unequally spaced straight lines, closer together at the poles.
See Meridians and Parallels. The poles and the central meridian are straight lines one half the length of the Equator.
"Scale is distorted north-south 29 percent along the Equator relative to the east-west dimension. This distortion decreases to zero at 49° 16’ N and S at the central meridian. Scale is correct only along these parallels. Nearer the poles, features are compressed in the north-south direction" (Environmental Systems Research Institute, 1997).
World maps only.
Eckert VI Projection
Source: Snyder and Voxland, 1989