Fig. 2. A tagged fin whale, showing placement of the bioacoustic probe during surfacing. Superimposed onto the image are the orthogonal axes of the accelerometer. The long axis of the tag was largely parallel with the longitudinal axis of the animal on all successful deployments. The x-axis is parallel with the long axis of the tag (red) and the y-axis extends radially on the tag (blue). Each axis detects static acceleration (A_x, A_y) in order to estimate the orientation of the animal in dimensions as defined by rotation about the y-axis, pitch (), and about the x-axis, roll (). An axis oriented parallel to gravity would result in 1.0 g recorded by the accelerometer, whereas an axis perpendicular to gravity would produce a 0.0 g accelerometer signal. Small-scale, dynamic oscillations detected by the x-axis were interpreted as fluking. The R/P FLIP, visible on the horizon, served as a research platform for visual and acoustic marine mammal monitoring operations.