Definition
The display divides depth into bands using the shallow contour, safety contour and deep contour. In four-shade mode, deep water is white, water between the safety and deep contours takes a pale blue, water between shallow and safety contours a stronger blue, and shallow water the deepest blue; drying areas take their own tint. Two-shade mode simplifies this to safe and unsafe about the safety contour, which many navigators prefer for clarity.
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