Which of the following Figure of Merit (FOM) readings indicates the lowest fix accuracy?

The Figure of Merit (FOM) is a standard used in navigation to indicate the accuracy of a position fix. The value of the FOM is inversely related to the accuracy; that is, the higher the FOM value, the poorer the accuracy of the position fix.

A FOM reading of 9 indicates the lowest accuracy among the listed options. This is because it represents a wider margin of error in the position fix, suggesting that the locations calculated are less reliable. In contrast, lower FOM numbers correspond to better accuracy, meaning that fixes with values such as 3 or 5 would be more precise and reliable.

Thus, identifying the FOM 9 as associated with the lowest fix accuracy provides an understanding of how these values function within the context of marine navigation, where precision is crucial for safe and effective operations.