When must navigation lights be displayed according to the Rules?

Navigation lights must be displayed from sunset to sunrise and may also be shown during daylight hours. This requirement is in place to ensure that vessels remain visible to one another during periods of low light and when navigation could be hazardous. The display of navigation lights at night is crucial for preventing collisions, as they signify the type and orientation of vessels, which allows mariners to make informed decisions about their course and actions.

Furthermore, while navigation lights are specifically required from sunset to sunrise, they are also permitted during daylight for added visibility in certain situations, particularly when a vessel might be in a busy channel or facing conditions that could obscure its detection by other vessels. Therefore, the option stating that navigation lights are required during nighttime and can be displayed in daylight is comprehensive and aligns with the rules designed to promote safety on the water.