This new feature of FINE is activated automatically after the crux is marked, because the fetal spine is located outside the 5 to 7 o’clock range, leading to the spine location alert depicted (7 to 8 o’clock). A Volume Orientation message appears on the screen, asking whether volume orientation to a fetal spine at 6 o’clock should occur (YES or NO). If the user clicks YES, reorientation will visibly occur (not shown), and the user will be asked to “Please mark crux again”, which should be performed (also see Video S6).