- For ships using ECDIS as their primary means of navigation (no paper charts), an additional and independent ECDIS shall be provided as a back-up. The backup ECDIS should be connected to an independent power supply and connected to systems providing continuous position-fixing capability. When the ECDIS is being operated in Raster Chart Display System (RCDS) mode using RNC data due to lack of suitable coverage of electronic navigational charts (ENC), then an appropriate folio of up-to-date paper charts must be maintained for areas where only raster chart coverage is available.
- For ships using ECDIS as an aid to navigation, the ship must carry and maintain an appropriate folio of up-to-date paper charts. The ECDIS should be able to operate in a normal capacity even when it is connected and supplied by an emergency source of electrical power. Change over from one source of power supply to another, including any interruptions in electrical supply should not require the equipment to be manually reinitialised for a period of 45 seconds.
