dalek
for the purpose of analysis, the system was working - pls read all technical reports: several positions were stored between waypoint change and power down/impact that lay along the 035 (mag of the time).
On that final leg from waypoint change to the crash site, just ignore the switch business for the moment as it does not matter if the crew could see anything on the display, they having effectively dumped the only immediately useful STANS waypoint at waypoint change.
I believe that they were focused on something else on that leg - the usefulness of the STANS data is that it allows us to establish things like the track and the position of the last altitude update from the encoding altimeter.
Get the reports on the STANS component systems and extract for yourself the position data and reconstruct the track - then pls tell us what you make of it.