What does FOM stand for in the context of GPS?

FOM, or Figure of Merit, is a term used in the context of GPS receivers to describe the accuracy and reliability of the positioning data they provide. The Figure of Merit takes into account various factors, such as satellite signal quality, geometry, and environmental conditions, to give an indication of how reliable the position fix is. A higher FOM indicates a more accurate and reliable position, while a lower FOM suggests less certainty about the fix.

This concept is critical in navigation and seamanship since precise positioning is essential for safe and effective navigation. By understanding the FOM, navigators can make informed decisions about their position and any potential limitations in their GPS data.