OceanTools Ltd. completed a redesign of their MA500 Precision Altimeter. DSP electronics combined with frequency swept CHIRP technology are housed in a hard anodized aluminium housing rated to 3000m as standard. The MA500 uses a new composite transducer array enabling altitude measurement with millimetric accuracy and resolution. It may be used in a range of harsh environment altitude measuring applications such as assisting the safe navigation of subsea vehicles, deployment of structures to the seabed and the monitoring and measurement of sediment and ice.