Abstract: A system that may include a slow clock event generator arranged to generate the slow clock event; a fast clock edge type detector that is arranged to perform a determination process of determining whether an earliest fast clock edge that occurs within a slow clock event is a rising clock edge or a falling clock edge, and whether a last fast clock edge that occurs within the slow clock event is a rising clock edge or a falling clock edge; and a counter module that is arranged to count fast clock cycles during the slow clock event to provide a duration estimate indicative of duration of the slow clock event and generate a slow clock event duration value indicative of the duration of the slow clock event, in response to the duration estimate and to a determination result that is indicative of an outcome of the determination process.

Abstract: A device for determining an angle of inclination of a ship has a curved guiding member fixedly connected with the ship and inclinable together with the latter, a rolling member arranged to roll on said guiding member in response to inclination of the ship and thereby inclination of said curved guiding member between a plurality of positions, and a recorder for recording the angle of inclination of the ship and operative in dependence upon a position of said rolling member on said curved guiding member.