The Collaborative International Dictionary of English v.0.48:
gangboard \gangboard\, gang board \gang board\n. a temporary bridge for getting on and off a vessel at dockside. Syn: gangplank, gang plank, gangway. [WordNet 1.5]WordNet (r) 3.0 (2006):
gangboard n 1: a temporary bridge for getting on and off a vessel at dockside [syn: gangplank, gangboard, gangway]