"Richard Kaplan" wrote in message
news:12314a1ab0a0c5f1420eacc57b51be6d@TeraNews...
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| "C J Campbell" wrote in message
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| It would be interesting to see some data that show that GPS is
frequently
| compromised by unintentional jamming. If someone says that GPS jamming
is
| a
| problem, the burden of proof is on them to support that assertion.
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| Intentional or not, there are frequent NOTAMs that GPS is unreliable in
| certain regions. Who knows if this is due to technical issues or military
| testing or whatever. No matter the cause, it is clear GPS can and will
| become inoperative at certain times in certain regions. It therefore
seems
| rational to expect that non-GPS backup nav system will need to remain in
| place indefinitely.


I might point out that VORs are also inoperative at certain time in certain
regions. The Mc Chord VOR has not worked in over a year, despite it being an
important airway intersection. So what are you suggesting we use for backup
navigation systems for the VOR?