When we use a combination of paper and electronic charts, care should be taken that all paper or all electronic charts are used at critical points of landfall, port arrival and pilotage etc. When transferring the details from a paper chart to an electronic chart display system or vice-versa the navigator should ensure that:
- Positions are transferred to and are verified on, electronic charts of an equivalent scale to that of the paper on which the position was originally plotted;
- Any differences in chart datum is applied to the transferred position;
- The plan is rechecked for accuracy before being used.