VNAV PTH is automatically re-engaged when the computed idle descent path is captured.
xetroV
Thanks for that detailed reply. So...... On the 777 in VNAV SPD there is no easy was to get back into VNAV PTH?? Unless you happen to recapture the computed idle descent path? Which without changing modes could only be achieved by adjusting speed to control the path (unless I suppose there was a waypoint with an altitude constraint to bring the two back together)
To recapture the computed idle path quicker V/S could be used for a shallow descent if low, or FLCH with a higher speed if high but then you wouldnt be in VNAV so how would it re-engage in VNAV PTH??
VNAV seems way overcomplicated!! I thought the "How to I get back into VNAV PTH" question would be simple but it doesnt seem that way.