Depths and contours ContentsDepth soundingsWater depth measurements displayed on charts are called Depth soundings. Depth contoursDepth contours, also known as bathymetric contours or depth curves, are lines drawn on cartography that connect points of equal depth creating a visualization of underwater bottom structure. Contours use color fills to indicate depth in relation to other contours.Parent topic: Chart app — GeneralPrevious topic: Rudder bar indicatorNext topic: Bathymetry recordings