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#171
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IFR with a VFR GPS
In article et,
"Steven P. McNicoll" wrote: Do you see any hazard in the use of a handheld GPS during enroute IFR flight? Increased risk of hazardously misleading information. I'll leave it to the safety experts to determine or estimate the increased risk. -- Bob Noel no one likes an educated mule |
#172
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IFR with a VFR GPS
"Bob Noel" wrote in message ... Increased risk of hazardously misleading information. What hazardously misleading information? I'll leave it to the safety experts to determine or estimate the increased risk. I posed a similar question to the safety experts some years ago, none could identify any risk. |
#173
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IFR with a VFR GPS
"Steven P. McNicoll" wrote:
Increased risk of hazardously misleading information. What hazardously misleading information? I posed a similar question to the safety experts some years ago, none could identify any risk. Steven, if you have other sources that will alert you to GPS HMI then you can make the assertion that from an overall system view you are protected. If not, then you are at risk. FACT! Of course the risk may be smaller than running out of gas and dying but it is quantifiable at the rate of about 10E-4 per hour. Ron Lee |
#174
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IFR with a VFR GPS
In article et,
"Steven P. McNicoll" wrote: Increased risk of hazardously misleading information. What hazardously misleading information? A navigation solution that is incorrect. I'll leave it to the safety experts to determine or estimate the increased risk. I posed a similar question to the safety experts some years ago, none could identify any risk. If those safety experts were unable to identify any risk, then they didn't knew the subject area. I suggest that you find some real safety experts with actual knowledge of aviation. -- Bob Noel no one likes an educated mule |
#175
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IFR with a VFR GPS
"Ron Lee" wrote in message ... Steven, if you have other sources that will alert you to GPS HMI then you can make the assertion that from an overall system view you are protected. If not, then you are at risk. FACT! Well, then, since there are other sources that will alert to GPS "HMI", we are protected. |
#176
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IFR with a VFR GPS
"Bob Noel" wrote in message ... A navigation solution that is incorrect. What is the hazard? If those safety experts were unable to identify any risk, then they didn't knew the subject area. I suggest that you find some real safety experts with actual knowledge of aviation. There is no risk. Anyone that says there is a risk in the use of a handheld GPS for IFR enroute navigation in US controlled airspace is not a real safety expert with actual knowledge of aviation. |
#177
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IFR with a VFR GPS
Jonathan Goodish wrote in message ... In article , (Ron Lee) wrote: Jonathan Goodish wrote: In my opinion, there is no practical difference for enroute navigation between a panel-mount certified GPS and a hand held which is not certified. Yes there is. RAIM provided integrity. As long as no signal error exists (vast majority of the time) then your assertion is basically correct. But what if signal error exists? How is risk increased because of it for enroute navigation? For practical purposes, it isn't. My understanding is that RAIM calculates your location using all available GPS signals and then goes back and "evaluates" each individual signal against the collective result to determine the amount of error that exists. If excessive error is present then that signal is disqualified from the position calculation. Its only when not enough signals are left after the disqualification process that the pilot will see a RAIM alert. |
#178
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IFR with a VFR GPS
A navigation solution that is incorrect.
What is the hazard? Cumulo Granite. Jose -- He who laughs, lasts. for Email, make the obvious change in the address. |
#179
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IFR with a VFR GPS
Steven P. McNicoll wrote:
"Tauno Voipio" wrote in message ... There is one fundamental difference to other means of IFR navigation: It is impossible to test and approve the GPS signal. For the other NAVAIDs the station can be measured on ground and fly the measuring flights and compare the results with the specs in ICAO Annex 10, and that's it. Been there - done that. Why is it impossible to test the GPS signal? It is possible to measure the signal, but it does not tell anything of the signals of the rest of the constellation. We can be pretty sure that an on-ground navaid station will preform quite like how it did when measuring it. There is no similar guarantee of a satellite system controlled by a foreign authority. Also, there are no internationally accepted standards of the GPS signal. For the other navaids, there are technical performance requirements in ICAO Annex 10 which is agreed to be legally binding to all member states. -- Tauno Voipio tauno voipio (at) iki fi |
#180
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IFR with a VFR GPS
"Jose" wrote in message .. . Cumulo Granite. Explain. |
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