ballast movement
ballast movement
[′bal·əst ‚müv·mənt] (navigation)
A voyage or leg of a voyage by a tanker during which no commercially valuable cargo is in the tanks; seawater is usually carried to maintain stability. Also known as ballast leg; ballast passage.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.