The Unity left Cowes, Isle of Wight on Nov 22, 1638, bound for Maryland.

'John Sheercliffe and others were
transported by Mrs Mary Throughton, a widow, into St.
Mary's County, the Province of Maryland.'
See John Shiercliffe

Unity sources:
Col. William D. Renner Sr. per The Archives of Maryland, Vol 1, page 15


Pilgrim Ship Lists 
Pilgrim Ship Passengers
Genealogy Main Page