SENC, ENC, RCDS, ENS
SENC:
System electronic navigational Chart. Once ENC loaded it becomes SENC. ECDIS can convert ENC data to SENC data. SENC data is available in base, standard, all other mode.
ENC:
Electronic navigational Chart. Just a file containing chart Information. Issued by hydrographic office. ENC may contain additional information.
RCDS:
Raster chart display system. Display RNC data. RNC contain required information and additional information.
RNC:
Raster navigational Chart. RNC contain required information and additional information.
ENS:
Electronic navigation system.
Ship as well as land vehicle can use this system to navigate.