Sonardyne’s Calibration-Free Acoustic Positioning Delivers Major Savings for CSA International. CSA International Inc, an environmental survey company working in the Gulf of Mexico, has become the first organisation in the world to purchase a new, ‘calibration-free’ acoustic positioning system launched by Sonardyne International Ltd. The GyroUSBL integrates Sonardyne’s Lodestar Attitude and Heading Reference System (AHRS) and sixth generation (6G®) Ultra-Short BaseLine (USBL)…