systems moving to the east

In the storm tactics clinics, when discussing the “dangerous semicircle”, the explanations are based on a westerly storm path (fig 3). The south of the system is considered as the safest side. This is not true for systems moving to the east ! In my sailing area, the channel and North Sea, depressions are moving mainly to the east. I should invert some statements. Some questions in the assessment seem to refer on westerly path (without notice). Ex heading to the north side of the system is consider as a poor tactic; south-eastern quadrant has the smallest wave.