Two taut-line sediment trap moorings deployed in Kao-ping Submarine Canyon were subjected to tidal flows, resulting in significant vertical movements and tilt of the mounted instruments. Based on simple trigonometric relations, the true heading and tilt angles were derived from the raw readings of heading, pitch, and roll of the two Nortek Aquadopp Doppler current meters (NADCM). The true tilt and heading angles of the NADCMs were highly correlated with depth and reflected the orientation of the axis of the canyon, respectively. The precluded data points of tilt and heading angles therefore can be reconstructed. Our study suggests a systematic way to rectify the heading and tilting of a sediment trap array of the mounted NADCM from raw readings of the heading, pitch and roll meters.