Looking for two captains and a sailor

My husband's great, great grandfather Niels Nielsen and great, great, great grandfather Christian (Kristian) Magnus Meyer were listed in census records as Skipper or ship masters. Christian's son Henrik M. Meyer was a sailor (Matros). Niels was born in Holbaek, Denmark, 1848. Christian was born about 1816 in Bergen, Norway. Henrik was born about about 1846 in Bergen, Norway. Would greatly appreciate any advice and assistance. Thank you Tonia Nielsen