While in ordinate dimensioning, Snapping point options of Tangent point and Quadrant point are NOT available.
Why is it? How could I dimension to the nose edge with ordinate dimension scheme?
If you're using the 'Type' option 'Single Dimension', than at least the 'Tangent Point' Snap Point is available. And before you ask why it's not available when applying 'Multiple Dimensions', try and imagine what TWO (generally at right-angles to each other) dimensions from the SAME 'Tangent Point' would even look like. I can't.
As for the 'Quadrant Point' Snap Point, I'm not really sure how much you'd gain by even having it. However, if you can show a good example of where that would be useful, please feel free to do so.