To aid collision avoidance, which display is most appropriate?

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The display that best supports collision avoidance uses a reference frame tied to the sea, so the water surface remains steady on the screen while your own vessel moves. With a sea-stabilized presentation, the background sea state stays in the same place, so what you see as moving are the other vessels' motions relative to you. This makes it easier to judge closing speed, bearing changes, and potential crossing paths quickly, even when the ship is rolling or pitching.

In practice, you want to distinguish true relative motion from effects caused by your own maneuver. Sea stabilization minimizes confusion from heading changes and sea state, letting you interpret a target’s future position and decide on avoidance maneuver more reliably. Ground-stabilized displays keep land-like features fixed, which is useful for navigation but can distract from assessing how another ship will interact with your own course. Relative motion displays show motion relative to your own ship, which is helpful, but without sea stabilization the display can be harder to read in rough seas because the background and own-ship indicators can shift in a way that obscures true relative movement. Lost track indication is simply an alert that a target track has been lost, not a view optimized for avoidance.