Nicholas Dobrée was the author or draughtsman of three notable Channel Islands charts, including one of the whole archipelago and a chart of Alderney . This is the chart of Guernsey and its adjacent islands. He was an Agent to the Admiralty and personally carried out the surveys and prepared the manuscript maps for the engravers. The quality of his work was considered excellent and his mapping of Guernsey to be far more accurate than his predecessors.

The map shows the Clos du Valle separated from the rest of the island by the Braye du Vale and linked to it by the Pont du Vale. Each of the parish churches is represented by a small engraved sketch. Other points of vantage or possible landmarks include several windmills and watch-houses. The amount of hydrographic information is exceptionally detailed. A rosette showing the run of the tides is shown in the top left hand corner and arrows indicate the direction of the flood tide around the island. Rocks, reefs and sandbanks are shown and named and soundings in fathoms are liberally given.