In sea stabilized mode, which data are used to stabilize the image?

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Sea stabilized mode keeps the radar picture steady relative to the sea surface by compensating for the ship’s own motion. To do this effectively, the system uses the vessel’s heading and its speed through the water. Heading provides the direction the hull is pointing, so the display can maintain the correct orientation, while speed through the water represents how fast the hull is moving through the water (excluding current). Using these inputs, the radar digitally shifts the image to cancel out the ship’s sway, pitch, and yaw, making stationary features on the sea appear fixed on the screen. Using course over ground and speed over ground would include drift from currents and winds, which isn’t what sea stabilization aims to cancel, and no stabilization would leave the image moving with the ship.