Wave steepness (s) is the ratio between wave height (H) and wavelength (L). When waves approach shallow waters, H increases and L decreases. When the ratio H/L reaches the value of 1/7, the wave breaks. Pitch poling and capsizing becomes real possibilities for smaller vessels when wave steepness is severe. Wave steepness seems to be a parameter at least as important as wave height, under some special circumstances even more important. The capsizing potential of a wave critically depends on the steepness of the crest front.