How are the limits of a colored sector of light indicated in the Light List?

The correct answer highlights how the limits of a colored sector of light are indicated in the Light List as true bearings observed from a vessel towards the light. This is essential because the bearings provide navigators with precise information on how to safely navigate within the sector, defining the extent to which the colored light can be seen.

In navigation, true bearings are based on true north, which helps ensure accuracy in chart readings and when plotting courses, as different vessels may be at varying distances and positions from the light. By providing these bearings, the Light List allows mariners to ascertain the acceptable navigational paths and avoid potential hazards that lie outside the indicated sector.

Using true bearings differs from magnetic bearings, which can fluctuate due to the local magnetic variations or deviations affecting compass readings. Therefore, having true bearings ensures consistency and reliability for navigators, especially when dealing with chart plotting and crossing different navigational charts where magnetic variations may apply.

In summary, indicating the limits of a colored sector in bearings observed from the vessel towards the light is crucial for ensuring safe navigation and efficient routing.