Navigation and Seamanship

1.4.7. Hints for using a chart

1.4.7. Hints to Remember when using charts

1. Always use the largest scale charts available for the area.

2. Note carefully the units in which soundings are given.

3. Familiarise yourself thoroughtly with graduations on the chart before reading the Latitude and Longitude.

4. When measuring distance, along the Latitude scale, the dividers should be used along the mean latitude between the two points.

5. When using the compass rose, the ruler must pass through the centre of compass rose and 180° on the opposite direction.

6. If in doubt about a “Cocked hat” always assume the ship to be closer to danger.

7. Always keep the chart dry. Keep bottles and pens away from the chart. Use soft black pencils and soft erasers. Never use copying pencils.