The term "equivalent projection" refers to a cartographic projection that preserves shape, area, and distance in a well-proportioned manner, without distortion. Synonyms for this term include equal-area projection, conformal map projection, or an isopleth projection. All these terms refer to a type of map projection that accurately represents the geography of the world in an even-handed way, without exaggerated or diminished proportions. Another synonym for equivalent projection is a Mercator projection, which is notable for its usefulness in navigation, though it can distort in some situations. Regardless of the synonym used, the ultimate goal of an equivalent projection is to provide an accurate representation of the earth's surface.