How often should a vessel record its position if the DSC is not GPS connected?

A vessel should record its position every 4 hours if the Digital Selective Calling (DSC) system is not connected to GPS. This frequency ensures that the vessel maintains an adequate log of its position, especially when navigating in open water or areas where precise location tracking is vital for safety. Regular position updates allow for timely situational awareness and can assist in emergencies, as it provides a reliable record of the vessel's route over time.

In the absence of GPS connectivity, extending the recording period too long can lead to potential issues with navigation and safety, as weather conditions or other factors could change significantly in that timeframe. Therefore, a 4-hour interval strikes a balance between maintaining navigational accuracy while not being burdensome for the crew.