Think of it this way:
You stand in the middle of some monsters. Use a Watera.
North:MAB
South:MACC
East:Crit Rate
West:Recast Reduction
Monster to the north takes more damage because it's north of caster. Caster's spell received MAB on this monster.
Monster to the south resists less because it's south of the caster. Caster's spell received MACC on this monster.
Monster to the east gets a critical hit because it's east of the caster. Caster's spell received enhanced Crit Rate on this mosnter
Monster to the west more damage because it's west of the caster. Caster's spell got a recast time reduction from this monster.
It's the monster's position in relation to yours, not the direction in which you face yourself. You can face south but the north monster is still north and therefore will get the MAB+.
Image from SE to prove: