What is a primary factor in determining the risk of collision?

The bearing of the approaching vessel is a key factor in assessing the risk of collision because it provides critical information about the relative direction and proximity of another vessel in the waterway. By understanding the bearing, a boater can determine whether a vessel is on a direct course towards them or if it is moving in a parallel or divergent direction. This knowledge helps in making informed decisions about navigation and evasive maneuvers.

While the number of vessels nearby can contribute to the risk, it does not offer the specific directional context that the bearing provides. Similarly, distance between vessels is important, but it is the bearing that indicates whether that distance is decreasing or safe. Lastly, although the type of vessels involved may suggest varying speeds or handling characteristics, the bearing directly impacts navigation strategies and collision avoidance, making it a primary concern.