Preserving the correct shape.
Related Terms 
OBLIQUE MERCATOR CHART
A chart on the oblique Mercator map projection. Also called OBLIQUE CYLINDRICAL ORTHOMORPHIC CHART.

CONFORMAL CHART
A chart using a conformal projection; also called orthomorphic chart

CONFORMAL MAP PROJECTION
A map projection in which all angles around any point are correctly represented, In such a projection the scale is the same in all directions about any point. Very small shapes are correctly represented, resulting in an orthomorphic projection. The terms conformal and orthomorphic are used synonymously since neither characteristic can exist without the other.

MERCATOR CHART
A chart on the Mercator projection. This is the chart commonly used for marine navigation. Also called EQUATORIAL CYLINDRICAL ORTHOMORPHIC CHART.

STEREOGRAPHIC MAP PROJECTION
A perspective, conformal, azimuthal map projection in which points on the surface of a sphere or spheroid, such as the earth, are conceived as projected by radial lines from any point on the surface to a plane tangent to the antipode of the point of projection. Circles project as circles except for great circles through the point of tangency, which project as straight lines. The principal navigational use of the projection is for charts of the polar regions. Also called AZlMUTHAL ORTHOMORPHIC MAP PROJECTION.
