Your ARPA has automatic speed inputs from the log. Due to currents, the log is indicating a faster speed than the speed over the ground. What should you expect under these circumstances?

In scenarios where the Automatic Radar Plotting Aids (ARPA) system receives speed inputs from a log that are inaccurately high due to currents, the output will reflect this discrepancy. As the log is indicating a faster speed than the actual speed over ground, the ARPA's calculations for the target's true course vector will also be affected.

The course vector is determined by the speed and heading of the vessel as reported by the navigation instruments. If the speed is overestimated, the ARPA will calculate the target's motion based on this incorrect data, leading to an error in the vector. This misrepresentation affects how the ARPA projects the target’s future position, potentially resulting in unsafe navigation decisions and an altered situational awareness.

Thus, the correct choice revolves around the fact that the true course vector of targets will indeed be in error, fundamentally impacting navigational assessments. Understanding this is crucial for maintaining safety and accuracy in navigation operations.