ECDIS - with Primary as well as Back Up means of Sea Navigation : - Issues .... While i am totally Busy With ECDIS based Navigation - The users-number is growing steadily alright, but it has to grow in all sectors of any new technology - from the those hands-use it for Navigation, those who regulate it, those who verify it, those who manage ships using it ........ seeing a DGPS beacon being erratic the port state may rightly question the ship's for applying Terrestrial Navigational Techniques, but are they also questioning the Harbour Pilots using AIS based Homing devices which will also lose accuracy and may shoot up to more than 100m inaccurate ...... this level of approach is far still .... but progress steadily in the right direction alright ..!!