My great-great grandfather, Walter Cole, was born at Ottery St.Mary, Devon, England in 1810. The family oral history is he shipped convicts to Australia approximately in the 1830's and 1840's. He married Grace Williams in 1843 and had 3 children. First census I obtained was 1851 where he is working in the Royal Marine Barracks in Plymouth as a servant. In 1852, he is working at Dartmoor Prison in Devon. My great grandmother, Agnes Cole was born there. In the 1861 census, he is receiving a Seaman's Pension. He passed away in 1870 at Plymouth, Devon at age 60.
My questions are: what entity did he work for when shipping and possibly what were the names of ships and his position or job description?