Definition: Sketch map
UN - Geographic Information Systems
A map (often hand-drawn) that shows main features of a given area but which may not have a high degree of positional accuracy and may thus not correctly represent distances and dimensions of objects. A sketch map may, however, have a high degree of logical accuracy, meaning that relationships between objects are correctly represented. Also called a schematic map or a cartoon map.
United Nations, "Handbook on Geospatial Infrastructure in Support of Census Activities", Department of Economic and Social Affairs, Statistics Division, Studies in Methods, Series F No. 103, New York, 2009