"Steven P. McNicoll" wrote:


"Ron Lee" wrote in message
...

A primary reason that handheld/VFR GPS units are not acceptable for
VFR use is that they not not include an integrity capability. That is
essential for IFR ops.


Can you explain why that is so?

Let me ask you a few things.

1) Are you aware that the clocks onboard a GPS satellite can
malfunction?

2) Are you aware that when a malfunction occurs that the users' GPS
unit derived position can drift off by hundreds or thousands of miles?

3) Are you aware that the pilot may well have ZERO indication of that
failure without an integrity functionality in his user equipment?

If your responses are "So," "So," and "So" then I have no desire to
ever fly with you if you are a pilot.

Ron Lee