Abstract: In some examples, a computer-implemented method for determining a state of a dependent user is provided. A flag is generated if a measured first parameter for a dependent user is within a range of values of a respective defined first parameter and a measured second parameter for the dependent user is within a range of values of a respective defined second parameter, and the measured first parameter and the measured second parameter occur within a temporal window.

Abstract: A method of passive acoustic source positioning of sea-going platforms is disclosed. The method includes positioning of RGPS pods and AHRS acoustic sensors on a fixed surface. Further, the method includes positioning an air gun including gun strings and positioning a set of reflective nodes (sonar bells) along each gun string on each gun cluster position with known fixed offsets. The reflective nodes will reflect the echo from the AHRS acoustic sensor, which will accurately capture their position and transmit the position data to a surface vessel.

Abstract: Method for acquiring seismic data by generating a first straight line (2) drawn from a starting point (3) to an end point (4), then generating a number of offset straight lines (6), each being placed perpendicular to the first straight line (2) and ending in a second point (7) in a distance X from the first straight line (2). The second points (7) provide an array of cross track offset values providing a survey line (10). A vessel steering module is described adapted to send command information to a vessel steering system. The invention also concerns use of the module for performing the method.

Abstract: A positioning system (100) for marine seismic surveying, comprising a towing vessel (110), a source array (120) and a receiver array (130) with several streamers (131). Each streamer (131) comprises at least three birds (134) and positioning sensors (134-137) wherein several seismic receivers (132) are placed between each pair of birds (134). The system (100) comprises a dynamic model wherein each streamer (131) is represented by a fitted B-spline curve and each bird (134) is associated with a constant velocity and a constant acceleration; and a Kalman filter using the dynamic model and observations from the positioning sensors (134-137) to provide a geodetic position of each seismic receiver (132) with better accuracy than the dynamic model alone and observations alone within a time interval ?t equal to or less than a minimum time between shots determined by the source array (120).

Abstract: Method and marine acoustic source array for generating an acoustic wave in a body of water. The marine acoustic source array includes first and second external source sub-arrays, each sub-array including one or more individual source elements; a first actuator device connected to the first external source sub-array; and a second actuator device connected to the second external source sub-array. The first actuator device has a corresponding cable configured to connect to a first lead-in, and the second actuator device has a corresponding cable configured to connect to a second lead-in such that a position of the source array as a whole is controllable along a line substantially perpendicular to a path of the source array.