Ground stabilized includes which factor that sea stabilized does not?

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Ground-stabilized uses a fixed earth frame for plotting targets, so the radar display accounts for how targets actually move over the ground, including drift caused by currents. This means current effects are represented on screen and factored into target motion. Sea-stabilized, on the other hand, is tied to the ship/sea frame, showing motion relative to the vessel, so the separate influence of currents on ground position isn’t reflected in the display. That’s why current effects are included with ground stabilization but not with sea stabilization.