Two kinds of tracking displays are

Two kinds of tracking displays are pursuit and compensatory displays. In pursuit
tracking, both the target and a controlled element move. The operator tries to keep the
controlled element on the target. The deviation between them is the error. In compensa-
tory displays, either the controlled element or the target is fixed, and the remaining element
moves in response to a control. Again, the operator tries to keep the two superimposed.
The display may present the deviation between targets as a planar representation or a
spatial one. The cursor appearing on a monitor for a computer mouse is an example of a
compensatory display.