"Ron Lee" wrote in message
...

Steven, when then are handheld GPS units not allowed to be used for
IFR navigation?


There is no specific prohibition on them.



You can do as you wish. Darwinism works well in aviation as in other
endeavors.


That sounds like you do believe there is a risk in the use of a handheld GPS
for IFR enroute navigation in US controlled airspace. Please identify that
risk.