DS/EN 61023:1994 Marine speed and distance measuring equipment (SDME) - Operational and performance requirements - Methods of testing and required test results
2008DS/EN 61023:2008 Maritime navigation and radiocommunication equipment and systems - Marine speed and distance measuring equipment (SDME) - Performance requirements, methods of testing and required test results
1994DS/EN 61023:1994 Marine speed and distance measuring equipment (SDME) - Operational and performance requirements - Methods of testing and required test results