Falling tide
Period during which the water level falls.
FAQ
Frequently Asked Questions (or Foire Aux Questions in French).
FFT
Fast Fourier Transform. Technique for representing a time signal in the spectral domain.
Fix sphere
Representation system in which reference is made to celestial bodies by their direction on a sphere whose position is fixed with respect to the stars.
Flood current or flood
Current accompanying the rising tide.
Foreshore
Coastal strip between the levels achieved by the highest and lowest tides.