The current required USCG stability letters for passenger sailing vessels provide little useful stability information to the master when operating their vessel in “typical” every day conditions. Sudden squalls, even moderate ones, with their rapid and relatively large increases in wind speed and/or shifts in direction can be of more concern to the master than full fledged storms, both for vessel and passenger safety. This paper will present an overview of SNAME’s ongoing SLIP project to improve operator guidance available for passenger sailing vessels, traditional and otherwise. New approaches to developing operator guidance for non full storm conditions and presenting that guidance in a manner useful to the master will be explored. In addition, the prototype instrumentation and data logging package installed onboard Pride of Baltimore II for her 2005 European cruise will also be discussed including the analysis of two squalls that were encountered.

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