British Admiralty charts, engraved from the Hydrographic Office founded in 1795, set the standard of 19th-century maritime cartography. Black engraved coastlines, depth soundings and fine lettering sit over a pale aqua-tinted water field, with buff land, muted-green drying areas, and ornate compass roses ruled with the rhumb lines of magnetic variation.

This system rebuilds the chart's reading ground: not bare paper but the documented pale chart-water tint, worked in fine engraved line and hatching. Everything is drawn — coastlines hachured, soundings set as small serif numerals, hazards dotted, and lights and special marks flagged in a single note of magenta.