When I retired from seagoing in February 2000, I was very familiar with the Admiralty Raster Scan chart system.
It depicted, on a monitor, the real chart in use with own ship track and position depicted from DGPS or DR if required. This is now in the process of being overtaken by the Electronic Navigation Chart, on the ECDIS, which is being introduced on an industry wide basis by 2018. Since the start date of ENC’s from 2010 onwards there have been many anomalies revealed, such as not showing all underwater dangers or displaying sectored lights correctly.
Anecdotally some equipment suppliers advised Captains to check the relevant paper chart if in doubt. It is also the case that full use of ECDIS is currently limited to areas between the Arctic and Antarctic circles. The default is to revert to Raster Scan charts for higher Latitudes or use paper charts. If the goal is to achieve an integrated paperless Bridge System then one must ask can this be safely done given the anomalies already arising and the ability of electronics and computers with external inputs to suffer gremlins.
I would much prefer Rasterscan with paper chart backup to give 100% certainty to the ships navigation and safety. I feel the rush to electronics is controlled by industry that is striving to find homes for all kinds of esoteric developments such as drones and crewless ships. There may be particular circumstances for specialist uses of electronic intervention but decisions and navigation should be fully controlled by the Navigator.
1 Cathedral Walk
Cloyne, Co Cork