What action should be taken when there is a discrepancy between GPS and other navigational data?

When faced with a discrepancy between GPS and other navigational data, the appropriate action is to validate and cross-check all navigation systems for accuracy. This is essential in ensuring safe navigation, as relying on just one source of information can lead to potentially dangerous situations.

By cross-checking GPS data with additional navigational aids, such as radar, other electronic navigation tools, or even paper charts, a navigator can confirm whether the GPS reading is erroneous or if there is an issue with other systems. This practice fosters a comprehensive understanding of the vessel's position and enhances situational awareness, thereby facilitating more informed decision-making.

In contrast, ignoring the GPS reading could compromise safety by potentially leading to incorrect positioning. Relying solely on visual navigation without corroborating data leaves room for human error due to visibility conditions or misinterpretation of landmarks. Restarting electronic systems may temporarily reset issues, but it does not address the underlying cause of the discrepancy or guarantee accuracy in navigation. Thus, validating and cross-checking all systems is paramount for maintaining navigational integrity.