By France, as far as the island of Ushant, and on the S.
In 1778 he served in the squadron of D'Orvilliers, and was present in the naval, battle of Ushant on the 27th of July 1778.
Numerous small archipelagoes and islands, of which the chief are Belle Tie, Groix and Ushant, fringe the Breton coast.- North of the Bay of St Michel the peninsula of Cotentin, terminating in the promontories of Hague and Barfleur, juts north into the English Channel and closes the bay of the Seine on the -west.
His map formed a parallelogram measuring 75,800 stadia from Usisama (Ushant island) or Sacrum Promontorium in the west to the mouth of the Ganges and the land of the Coniaci (Comorin) in the east, and 46,000 stadia from Thule in the north to the supposed southern limit of Libya.
His first engagement was the battle off Ushant in 1778, and, soon afterwards transferred to the West Indies, he was present, under the command of his cousin Sir Samuel Hood, at all the actions which culminated in Rodney's victory of April 12th, 1782.
If these figures (16, 17, 18 and 19 hours) are to be pressed, they would refer to, say, Ushant (48° N.), Flamborough Head (54°), Tarbet Ness in Ross (58°) and the northernmost Shetlands (61 °).
Pytheas's notice of the depth of the Bay of Biscay, of the length of the projection of Brittany, of Ushant under the name of Uxisama, and of three promontories of Britain, two of which seem to correspond to Land's End (Beler'ion), and North Foreland (Kantion), must not be forgotten.