Here is a list of all variables with links to the classes they belong to:

_altitude : MABaseOverlay
_needsLoadStrokeTexture : MAOverlayRenderer
_needsUpdate : MAOverlayRenderer
_strokeTextureID : MAOverlayRenderer
_strokeTextureSize : MAOverlayRenderer
_subtitle : MAShape
_title : MAShape
begin : MAPathShowRange
center : MACoordinateRegion
end : MAPathShowRange
height : MAMapSize
latitudeDelta : MACoordinateSpan
longitudeDelta : MACoordinateSpan
northEast : MACoordinateBounds
origin : MAMapRect
size : MAMapRect
southWest : MACoordinateBounds
span : MACoordinateRegion
width : MAMapSize
x : MAMapPoint
y : MAMapPoint