These charts were originally bound into Bradley's manuscript journal, the first three as frontispieces, the others opposite pp. 40 (chart 4), 46 (chart 5), 76 (chart 6), 77 (chart 7), 173 (chart 8), 176 (chart 9), 179 (chart 10), 186 (chart 11), 224 (chart 12), 225 (chart 13), 247 (chart 14), 249 (chart 15), 251 (chart 16), 260 (chart 17), 264 (chart 18), 267 (chart 19), 268 (chart 20), 270 (chart 21), 280 (chart 22). Charts 5, 12 and 13 were bound preceding the illustrations in the same openings, and chart 17 following.
They were probably drawn some years after the voyages they record as the entire journal seems to be a fair copy made ca 1802.