A rough drawing drawn without a scale is called a_
Sketch Map: A sketch is a drawing mainly based on memory and spot observation and not to scale.
Sometimes, a rough drawing is required of an area to tell where a particular thing can be found or located with respect to other things. Such a rough drawing drawn without a scale is called a Sketch Map.
For example,
Here, a map is shown from Home to School, which is drawn roughly and not to scale. And it is based on memory. So it is an example of a sketch map.