"Peter R." wrote in message
...

What other navigational system is used once the aircraft is cleared for a
GPS approach?


Anything the pilot has available and wishes to use.



The presence of the GPS may be irrelevant to the cause of the accident,
but
it is completely relevant to my original point that a pilot may be tempted
to use a VFR GPS as the sole means of navigation, legal or otherwise.


That was idiocy.