The FAA and Transport Canada recognize only the LPV approach as a "precision" approach.
LNAV and LNAV/VNAV are considered "non precision" approaches.
Any approach (LNAV and LNAV/VNAV) that shows its minimum as a MDA minimum must not be flown below that minimum in the event of a missed approach (usually) and that is the reason for some operations adding an increase of 50 feet to that MDA to make it a DA.