1. Ideally on a weekly basis, or at least before you sail, go to Imray website and search by chart number.
2. Download the most recent Correction Notice relevant to your chart.
3. Check the edition and correction date of your chart and begin correcting from the “corrected to” date.
4. Make sure to apply the corrections in a chronological order.
5. Locate the position by coordinate on the chart, if necessary using a pair of dividers.
6. Using a 2B pencil, neatly cross out the existing feature in question. Add the correction. Any errors can be erased using a soft eraser.
7. Note down the correction number starting with ILNW XXX/YY next to the mark-up for future reference.
8. Attach the printed Correction Notice to the chart or store it where it is easily accessible.
9. For block corrections (corrections which look like a section of a chart), print off the correction notice. Take care to do this at 100% of original size.
10. Use scissors or a craft knife to cut out the block correction. Use a Pritt glue stick or similar to gently adhere the block correction over the correct area of the chart. This block correction contains all of the relevant updates for that area.