This study aims to determine the use of nautical maps in supporting the use and operation of ECDIS on KM Ships. HODASCO 19 in the management of navigating on board. This research was carried out for one year on the KM Ship. HODASCO 19 with ship's type general cargo owned by PT Mandiri Sejahtera Abadi Line. This research uses an analytical descriptive method with a qualitative type of approach content. How to collect data through observation, interviews and documentation. The results showed the use of navigation using ECDIS nautical maps on board KM ships. HODASCO 19 in the management of navigating includes users who are more familiar, users who cannot accidentally change navigation information, are cheaper and faster to produce, have a wider availability of official raster charts and are more accurate for finding location points.