How often must the primary positioning source be verified in restricted waters?

In restricted waters, it is essential to verify the primary positioning source at least once per day. This requirement ensures navigational accuracy and safety, as restricted waters can present numerous hazards and potential obstructions. Frequent verification allows for timely detection of any discrepancies or failures in the positioning systems, which is critical for maintaining effective navigation.

The practice stems from the fact that environmental factors, equipment limitations, and other influences can impact positioning accuracy. By establishing a daily verification standard, mariners can mitigate risks associated with navigational errors when operating in confined or congested areas. Regular checks also help in maintaining situational awareness and ensuring that the vessel remains on the correct course, particularly in regions where the possibility of grounding or collision is heightened.

The other suggested frequencies for verification, such as once per trip, every hour, or only when entering new zones, do not adequately account for the dynamic conditions and potential changes that can occur throughout the day in such environments. Therefore, the daily verification standard is the most appropriate for ensuring safe navigation in restricted waters.