Echo Altimeter Features Applications Technical Software   The echo altimeter is a high specification product which offers unrivalled accuracy with its combination of 16 bit digital resolution and state of the art analog receiver circuitry. It is available in a range of housings from 300m plastic to 6000m rated titanium Echo has a choice of two frequency / range combinations, with a colour coding system to allow easy identification. Red = 200kHz, Blue = 500kHz. Echo uses Sonavision's RS232/485 autosense communications, responding to either downlink command without need to open housing to change The echo is used within Sonavision's Centaur Bathymetric Sensor,