What does a change in range scale imply for ARPA tracks, and how should you respond?

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Changing the range scale changes how ARPA tracks are plotted, so the system must re-sample the data to fit the new display. That re-sampling can momentarily affect track continuity, so you should verify that all tracks stay connected to their predicted paths and check for any contact that appears lost during the scale change. If a track drops or its continuity is broken, reacquire or reinitialize the track to maintain an accurate picture. This change does not affect the vessel’s speed, and it isn’t guaranteed to update all tracks automatically without your input.