Target trail feature generates a monotone or gradual shading afterglow on all objects on the display in order to help clarify traffic situation. Echo trails can be displayed in either true or relative motion (only true trail on TM). Relative trails show relative movements between targets and own ship. True motion trails require a gyrocompass signal and own ship speed input to cancel own ship's movement and present true target movements in accordance with their over-the-ground speeds and courses.