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moored vessel bearing lights and other signal devices to guide ships and warn of hazards to navigation. Lightships are generally stationed at points where a lighthouse cannot be erected; they are given distinctive features (e.g., high bows, special coloring) so as to be readily distinguishable from other vessels, and they have strong hulls, able to withstand consistent pressures. The first lightship in the United States was posted in 1820 (in the Elizabeth River, near Norfolk, Va.). Afterward, for a time, lightships proliferated; but their number has steadily decreased since the end of World War I. They are costly to staff and maintain, and various engineering developments, such as the construction of large radio buoys, have helped to reduce the need for them. Shortly before World War II all U.S. lightships were placed under the control of the U.S. Coast Guard.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.


A distinctively marked vessel anchored or moored at a charted point, to serve as an aid to navigation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


a ship equipped as a lighthouse and moored where a fixed structure would prove impracticable
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


An early family of client/server tools for analyzing data from multidimensional databases from Pilot Software, Cambridge, MA (, a pioneer in the OLAP database field. LightShip included tools for financial modeling, budgeting and consolidation of large databases. It provided Windows-based point-and-click reporting, a full programming language for advanced users, and support for all the popular databases.
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References in periodicals archive ?
The tri-municipal North Shore Emergency Management in Greater Vancouver is working with Lightship Works on Research & Development (R&D) as it relates to emergency preparedness, response, and recovery work.
Owner Alan Roberts watches as the lightship is towed away Picture: COLIN LANE
To gain a time-to-market advantage and retain its customers, Lightship deployed ADC's CBP, and, since then, has sponsored new multiple product promotions and implemented new rating plans in days rather than months, enabling it to react swiftly to the evolving competitive landscape.
The Canal & River Trust said it had no choice but to seize the lightship because it had not been licensed to be in the dock or trade, since February last year.
Planet's new owners, Alan Roberts, Sharon Sarsfield, Tom and Angela Surtees, all from Halewood, boarded the lightship last Thursday to receive the keys from former owner, Gary McClarnan, a Manchester music entrepreneur.
A spokesman said: "The lightship is being taken to a safe and secure location outside of Liverpool.
THE article on the lightship (South Wales Echo, July 11) brought back many happy memories.
The two couples from Halewood formed a new company, LV23 Planet Bar, to operate the 1960- built lightship as a tourist attraction in her high-profile Canning Dock berth, alongside The Strand.
A RADIO mast standing 50ft high will be erected on Planet, the former Mersey Bar lightship tomorrow for her role in marking the 50th anniversary of pirate station Radio Caroline North.
The distinctive red Lightship is 60 this year and has also been in service as a floating Christian centre for the past two decades.
Views of the area usually include shots of the Planet Lightship. Strange then that the Albert Dock company managers described her as, "inappropriate for Albert Dock".
THE 200th anniversary of the Mersey Bar beacon will now be celebrated after plans for the Planet lightship to become a floating B&B got the go-ahead.