What does it mean if Ho is greater than Hc in navigation?

When the observed height (Ho) is greater than the corrected height (Hc) in navigation, it indicates that the observer is, indeed, moving towards the geographic position of the object being observed. In the context of navigation, Ho represents the height of an object as seen from the observer's position, while Hc accounts for factors like the observer's altitude and atmospheric conditions.

If Ho exceeds Hc, it implies that the vertical angle of the object appears higher than what would be corrected for the observer’s position. This situation often occurs when the observer is closing in on the object, making its angular elevation appear greater. In practical terms, this suggests that the observer is getting closer to the geographic location of interest, thereby confirming that the navigation course is accurate with respect to the intended destination.

This understanding is crucial in navigation because it helps in making adjustments to the course and positioning, ensuring safe and effective travel over water.