Jason entered service in 1805 under the command of Captain P. William Champain, and served in the Leeward Islands as the flagship of Admiral Sir Alexander Cochrane.

[3] In 1807, Jason was detached, together with the brig Wolverine, to the coast of Surinam to search for the French sloop Favorite, which she discovered in January and captured in a short engagement.

The rebellion spread to the ship and it was only with difficulty that the officers subdued the mutineers, the first lieutenant driving them below with a pike and locking them in; 45 men were later court martialled at Halifax, Nova Scotia.

[5] In 1809 command passed to Captain William Maude and Jason participated in the attack on the Topaze off Guadeloupe in the successful Action of 22 January 1809.

There they were blockaded until 14 April, when a British force under Major-General Frederick Maitland and Captain Philip Beaver in Acasta, invaded and captured the islands.

[Note 6] In 1814 Jason formed part of the escort for King Louis XVIII of France and later for the Russian and Prussian Emperors during the negotiations to end the Napoleonic Wars.