What ships might have been based near Grimsby on the Humber in the age of sail?
Short answerMostly convoy escorts, including some frigates but more often brigs and other smaller vessels suited to coastal work.
NotesThe Humber's position makes convoy protection the most plausible naval function in the age of sail. Frigates could operate from the estuary when a larger escort or independent cruiser was required. Brigs and smaller vessels would be more common because routine coastal and convoy duties did not require ships of the line. The answer is a compact example of how geography and mission determine the scale of vessels based at a port.