ghost track, shown as a little ring, transformed onto the approach path of the next-in-sequence aircraft
chevron, indicating minimum time-based separation to the next-in-sequence aircraft
the ghost track and chevron are highlighted when the corresponding track label is highlighted, to minimize confusion about which ghost track/chevron corresponds to which aircraft
During the project, this functionality was deemed valuable but complemental to a decision support system for curved approaches (because the decision to assigned a curved approach occurs at an earlier point in time). Other projects address similar functionality in more detail, so the concept was left at a fairly basic implementation.