Steady-state tracking duration is based on which interval according to IMO Tracking standards?

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Steady-state tracking duration is the period over which a target must remain tracked for the system to consider the tracking reliable. IMO Tracking standards specify that this duration is based on an interval of either one minute or three minutes, chosen depending on the target and conditions. A one-minute interval allows quick confirmation of a stable track for clear, steady targets with good radar returns. In more challenging situations—noisy measurements, maneuvering targets, or clutter—a longer three-minute interval provides enough data to confirm the track is truly steady rather than a momentary fluctuation. Other longer intervals would unnecessarily delay confirmation or be inconsistent with standard practice, so the supported durations are one minute or three minutes.