C-MAP depth contours
When using C-MAP® charts depth contours are automatically colored using a blue color gradient with the shallowest contour using the darkest shade and the deepest using white.
Figure 1. Example C-MAP® Charts Depth contours
Depth contours — All depth contours are identified using a line and a blue color fill.
Deep contour — All depths deeper than the depth specified in the Deep contour: setting is colored white by default.
Deep water color
The color used for the Deep contour can be set to either white or blue. When set to blue the color fill shading is switched so that the Deep water contour will use the darkest shade of blue and the blue fill will get lighter the shallower the contour.
The depth contour settings can be accessed -from the Depths settings menu: .