Night navigation presents additional challenges. You should always operate at a slower speed at night and be on sharp lookout for the lights of other vessels. The lights displayed by other vessels will help you determine whether they are operating under power or sail, and their direction of travel. Once you’ve determined this, you apply the same navigation rules used in the daytime. However, never assume that the lights of other vessels are working properly. Allow plenty of time and distance to give way if needed, even if the lights indicate you are the stand-on vessel.