Inadequate stability is the proximate cause of a significant share of passenger vessel casualties worldwide. A disproportionate majority of these incidents involve domestic ferries in developing nations, where there is little enforcement of internationally accepted standards. This paper describes an ongoing effort to develop an on-board device that monitors vessel stability in real time and provides alerts and guidance to the operator. The theoretical feasibility of the project is demonstrated through a review of previous work. Several methods of obtaining stability parameters from vessel's motions are presented. The conceptual design of the device and network make use of lowcost hardware and open-source software, intended to make the device accessible and scalable for operators. Interfaces for vessel operators, passengers, and regulatory agencies are envisioned, maximizing the utility of the data.

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