She did not appear in Lloyd's Register (LR) until 1810, suggesting that she remained owned in the United States.
On 3 August 1805, HMS Calcutta, Captain Woodriff, left St Helena as escort of a motley convoy to England.
The convoy consisted of the East India company's "extra-ship" Indus, from Madras, the southern whaler African from Desolation Island, the whaler Fox from the Mozambique channel, the whaler Grand Sachem from the Peruvian coast and bound to Milford, the Prussian ship Wilhelmina, which Calcutta had detained on her way out to St Helena, and the large Swedish ship Carolina, which was sailing from China and asked to join.
4th whaling voyage (1812–1814): Captain Coffin sailed from Cork on 4 April 1812, in a convoy for the West Indies under escort of the Cruizer-class brig-sloop HMS Trinculo.
She had lost the gudgeons of her rudder and Commander Alexander Renny,[8] of Trinculo, had ordered Coffin to make for the nearest port.
[9] In February 1813 Good Sachem was well in the South Sea fishery, in this case Timor, as were Inspector, Albion, Baroness Longueville, Ocean, Thames, and Venus.
[11] Grand Sachem's owners applied for a licence to sail to certain ports in the East Indies under the provisions for whalers.
Grand Sachem returned to Milford Haven on 14 November 1814; she carried the product of the 96 whales her crew had killed.
[b] Grand Sachem was offered for sale at auction in late July 1815, lying in the Surrey Canal.
5th whaling voyage (1815–1816): Captain James Downey sailed from London in 1815, bound for Desolation Island.
6th whaling voyage (1816–1818): Captain Joseph Darney sailed from London on 4 August 1816; on 4 September she was at Boa Vista, Cape Verde.
7th whaling voyage (1818–1819): On 22 June 1818, Grand Sachem, [David] Littlejohn, master, sailed from Gravesend, Kent for the South Seas.
On 23 August 1820, the schooner Magnet, Vine, master, spoke a boat from Grand Sachem off the island of Boure.
[18] On 16 November 1821 Grand Sachem, Wright, master, sailed for London from St Helena.