What does a radar bearing that remains fairly constant indicate?

A radar bearing that remains fairly constant indicates a potential collision course. When observing other vessels on radar, if the bearing (the angle relative to the north) remains unchanged over time, it suggests that the target vessel is directly on a path towards your vessel. This is an important concept in collision avoidance, as maintaining a constant radar bearing typically means that the vessels are closing in on each other at a similar relative speed.

This situation allows boat crew members to assess their own speed and course in relation to the other vessel to determine if evasive actions are necessary to avoid a collision. Recognizing a constant radar bearing is critical for safe navigation in busy waterways where multiple vessels may be present. Understanding this helps boat crew members make informed decisions to ensure safe operations.