Which reference represents average heights during spring tides?

The reference that represents average heights during spring tides is Mean High Water Springs. Spring tides occur when the sun and moon are aligned, leading to higher high tides and lower low tides. Mean High Water Springs specifically measures the average height of the high water that occurs during these spring tide events, which is typically higher than average due to the enhanced gravitational pull from the alignment of the celestial bodies.

This measurement is crucial for navigation and maritime activities as it helps mariners understand and anticipate variations in water levels, especially in shallow areas. It provides a clear indication of the maximum height that can be expected during the strongest tidal effects.

Understanding the terminology is important for operations that depend on accurate tide predictions, such as docking, mooring, and navigating through narrow channels.