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Colour standing for depth.
Also known as: Depth tint, Blue tinting chart
The convention colouring water on a chart or map by depth band.
Colours water by depth band between bathymetric contours.
Contexts: Navigation, Maps
Runs opposite to the land convention: darker means deeper on water and darker means higher on land, so a single map's colour ramp reverses direction at the coastline.
Contexts: Navigation, Maps
On navigational charts the shallowest band is often the most heavily tinted rather than the least, because on a chart the danger is shallow water and the tint marks hazard rather than depth.
Contexts: Navigation, Maps
Bands of blue between depth contours, conventionally darkening with depth, with the shallowest water sometimes left white.