Which of the following best describes coast tracks in radar or non-radar separation applications?

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Coast tracks are extrapolated positions that continued the target’s last known motion after data updates stop. In radar or non-radar separation, you must base spacing on current, verified information. Relying on coast tracks assumes the aircraft will continue exactly as before, but pilots can accelerate, slow down, turn, or climb in ways that disrupt the predicted path. That makes coast tracks unreliable for enforcing separation, because the actual position can diverge from the forecast and threaten safe distance. So, coast tracks should not be used for maintaining separation; they might be used only as a temporary aid to re-establish contact or to plan while contact is broken, not as the basis for separation decisions.