RoxAnn GD-X Features Applications Technical FAQs   The RoxAnn GD-X GroundMaster is an "all-in-one" portable, seabed classification system designed to be used onboard small vessels - the perfect choice where there is no dedicated survey vessel. Used for inshore and coastal water survey, it interfaces with GPS/DGPS and data is displayed via RoxMap Software program on the survey PC. It is supplied with a built-in echosounder and is available for single or dual frequency operation