It is a mark of the enduring legacy of Jefferys work that it lasted, in print, for so long after his death. The chart includes a great deal of hydrographical information including soundings and channels through the great Bahama Banks north of Cuba. He also marks sandbanks, reefs currents, anchorages and Rhumb or loxodromic lines[1].
The Florida Keys and the Martyrs are also shown with detailed hydrographical information. The inclusion of ships to illustrate the channels not only decorates the chart but it also highlights the economic importance of the area at the time.
There is a good deal of detail provided about the island of Cuba. Relief is depicted pictorially and all of the major settlements are shown, along with major roads, paths and rivers. The map even details cattle farms ('Hatos') or large herds of cattle on the south Eastern coast of the island.
Overall, the chart is very stylish and it does everything one would want as an arm-chair sailor back in London at the end of the 18th century. It is informative, artistic and historic, but one wouldn't want to navigate by it.
[1]. Taken from an initial bearing it is a line on a sphere that cuts all meridians at the same angle. It is the path taken by a ship that maintains a constant compass direction. Such lines were only really useful in waters that were bounded by not too distant landfall as they did not take account of the curvature of the earth.
