Among the more intriguing facts that this fascinating book contains is this statistic: by 1803, nearly 20 percent of seamen's jobs were filled by black men, most of them freemen. Historian Jeffrey Bolster, himself a sailor for a decade, covers the story of black sailors from Africa through mid-1800s America. Working as seamen helped blacks support families and helped facilitate communication among widely dispersed people. There were dangers--free blacks could be kidnapped and sold into slavery, and all black sailors were subject to vicious racism. Yet for all the drawbacks, sailing was a profession black men saw as "an occupation of opportunity."