[3] She first appeared in Lloyd's List's (LL) ship arrival and departure (SAD) data as having left Sheerness on 8 June 1804 bound for Tonningen, together with the armed cutter Success.

On 28 May 1805 Lloyd's List (LL) reported that the armed ships Rosina, Magdalen, Ranger, and Providence had arrived at Elsinore on 14 May with their convoy.

[5][1] The pattern of Rosina escorting convoys between Sheerness or the Nore and Elsinore continued in 1805.

On 10 September Rosina left Saint Petersburg, escorting a fleet of merchantmen.

On 6 October they encountered a gale that resulted in the loss of some 30 of the merchantmen on the Riga Bar.