Returns position that is given distance and relative direction away from original object. The alternative syntax available from Arma 3 v 2.14, returns the position offset of the attached object. If the animated memory point is used for attachment, the offset is calculated in render scope.
getPos vs getRelPos: getRelPos operates similarly to getPos except in getRelPos the direction is calculated 'relative' to the current object direction whereas getPos's direction is from North. Thus while getPos can take a position array as it is starting point, getRelPos requires an object with its own azimut heading.