In restricted visibility, what should you avoid when altering course for a vessel forward of your beam that you cannot see visually?

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In restricted visibility you must act conservatively when a vessel ahead of your beam isn’t visible. Altering course toward an unseen target can put you into its potential path because you cannot confirm its position or maneuvering. Therefore, steering toward the port side to avoid a risk is avoided unless you are overtaking a vessel on that side. The safer approach is to keep your current course or steer to starboard if necessary, while using radar/ARPA to monitor range and bearing and reduce speed to buy time for a safe decision. The exception is overtaking: if you are certain you are passing behind a vessel on your port side, altering course to port is permissible.