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IFR with a VFR GPS



 
 
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  #21  
Old November 9th 05, 10:26 PM
Peter R.
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Default IFR with a VFR GPS

"Steven P. McNicoll" wrote:

"Peter R." wrote in message
...

Primary navigation (the VFR GPS) is no longer reliable, the aircraft is
IMC, and the pilot is unaware that the unit is no longer reliable. Those
are not properties of a problem?


I don't think so. If the aircraft drifts off course the controller will
nudge it back and the pilot will then be aware that the unit is no longer
reliable. No problem.


Assuming the aircraft is in controlled airspace. What if it isn't?

--
Peter
























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  #22  
Old November 9th 05, 10:27 PM
Peter R.
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Default IFR with a VFR GPS

"Peter R." wrote:

"Steven P. McNicoll" wrote:

"Peter R." wrote in message
...

Primary navigation (the VFR GPS) is no longer reliable, the aircraft is
IMC, and the pilot is unaware that the unit is no longer reliable. Those
are not properties of a problem?


I don't think so. If the aircraft drifts off course the controller will
nudge it back and the pilot will then be aware that the unit is no longer
reliable. No problem.


Assuming the aircraft is in controlled airspace. What if it isn't?


Sorry, I mean assuming the aircraft is in radar contact.

--
Peter
























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  #23  
Old November 10th 05, 12:15 AM
Steven P. McNicoll
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Default IFR with a VFR GPS


"Peter R." wrote in message
...

Assuming the aircraft is in controlled airspace. What if it isn't?


We're not assuming the aircraft is in controlled airspace, we know it is.
That was established in the original message.


  #24  
Old November 10th 05, 12:24 AM
Steven P. McNicoll
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Default IFR with a VFR GPS


"Peter R." wrote in message
...

Sorry, I mean assuming the aircraft is in radar contact.


Radar monitoring is required for off-airways routes beyond navaid
altitude/distance limits. So if not in radar contact your route will be via
airways or between navaids within the established limits. You'll know the
VFR GPS is unreliable when it no longer agrees with your more traditional
navigation radios.


  #25  
Old November 10th 05, 01:22 AM
Peter R.
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Default IFR with a VFR GPS

"Steven P. McNicoll" wrote:

You'll know the
VFR GPS is unreliable when it no longer agrees with your more
traditional navigation radios.


Assuming the pilot is continually tuning his traditional navigation radios,
then including those in his instrument scan. And what if he does not?

You asked what the risks of flying IFR with a VFR GPS are. There's one.

--
Peter
























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  #26  
Old November 10th 05, 02:03 AM
Steven P. McNicoll
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Default IFR with a VFR GPS


"Peter R." wrote in message
...

Assuming the pilot is continually tuning his traditional navigation
radios,
then including those in his instrument scan. And what if he does not?


Why would he do that?



You asked what the risks of flying IFR with a VFR GPS are. There's one.


But I didn't ask what are the risks of flying IFR using a VFR GPS
exclusively.


  #27  
Old November 10th 05, 02:32 AM
Peter R.
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Default IFR with a VFR GPS

"Steven P. McNicoll" wrote:

But I didn't ask what are the risks of flying IFR using a VFR GPS
exclusively.


You didn't ask what are the risks of flying IFR using a VFR GPS in concert
with other navigation instruments, either.

--
Peter
























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  #28  
Old November 10th 05, 02:44 AM
Steven P. McNicoll
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Default IFR with a VFR GPS


"Peter R." wrote in message
...

You didn't ask what are the risks of flying IFR using a VFR GPS in concert
with other navigation instruments, either.


No, I didn't. I didn't have to, as the the other navigation instruments are
required to be there. The bottom line is you haven't identified any risk
from flying IFR with a VFR GPS.


  #29  
Old November 10th 05, 02:49 AM
Peter R.
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Default IFR with a VFR GPS

"Steven P. McNicoll" wrote:

No, I didn't. I didn't have to, as the the other navigation instruments are
required to be there.


Are they required to be used?

The bottom line is you haven't identified any risk
from flying IFR with a VFR GPS.


Yes I did. Just because your newsgroup pride won't let you recognize it
doesn't mean it didn't happen.

--
Peter
























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  #30  
Old November 10th 05, 02:52 AM
Ron Lee
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Default IFR with a VFR GPS

"Peter R." wrote:

"Steven P. McNicoll" wrote:

"Peter R." wrote in message
...

What happens when these VFR GPS's drop reception of all but one or two
satellites? Do they instantly provide a RAIM message?


I don't know? Is it a problem if they don't?


If the pilot were using the unit for primary navigation in IMC and the unit
did not warn the pilot of too few satellites to be able to calculate
position, would that be a problem?


You should note that if you lose lock (too few satellites) then your
display will start flashing (or portions of it). That is not RAIM
which determines if you have a signal error.

Ron Lee
 




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