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#91
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IFR with a VFR GPS
Without getting into the middle of this general discussion, I'd like to point out
one thing about RAIM that seems to be misunderstood... One of the primary purposes of RAIM is 'Predict" when a coverage 'problem' will occur and notify you before it happens. Now, it can only predict such coverage problems (shortage of sats in view) based on the orbits and times of the current sat configuration. It may not know if a specific sat has gone 'out of service'. Of course, out of service sats and normal coverage shortages are rare these days, but they do happen. The IFR units will tell you about the upcoming problem BEFORE it happens, while VFR units will only tell you after it has occurred. A bigger problem is probably some of the testing that goes on in some locations which make any GPS unit unusable. Watch those NOTAMs! Peter wrote: Jonathan Goodish wrote: When my hand held Garmin loses enough sats for position calculation, I receive an alarm on the unit (both visual and audible). Right, but some of the old units (the 10 year old but still widely used Garmin 195 being one case that keeps popping up anecdotally) don't implement this properly. |
#92
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IFR with a VFR GPS
: technological level than in the USA; the pilot magazines also largely
: ignore the IFR market. And IFR activity is even lower elsewhere in : Europe. Interesting. Perhaps some Canadians reading can pipe in on this idea. This past summer while flying through Canada to Alaska, it certainly seemed like IFR was the vast minority. I'm sure some of it was that I was in the sticks for a lot of the time, but even in the relatively populated plains provinces, one didn't hear much about IFR traffic (or traffic at all for that matter). Perhaps the US just has more infrastructure so IFR is easier to do casually for PP? Just a thought... not harping on anyone's turf... -Cory -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
#93
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IFR with a VFR GPS
Perhaps, but the reason for my reference to the accident in this thread was
to support my point that the possibility exists for instrument-rated pilots to use a VFR GPS as the only means of navigation. It is unquestionable that this accident pilot did. It is =not= unquestionable that this accident pilot did. It is known that a VFR GPS was found at the accident site. If a tuna sandwich was found there, would that be incontrivertable evidence that the pilot was relying solely on a tuna sandwich for IFR flight? Jose -- He who laughs, lasts. for Email, make the obvious change in the address. |
#94
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IFR with a VFR GPS
On Thu, 10 Nov 2005 22:36:32 -0500, Wizard of Draws
wrote: My new Airmap 2000c, which was the reason for this thread, has them. Vintage Garmin 195, updated software and database, has them, and approaches as well. |
#95
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IFR with a VFR GPS
Jose,
If a tuna sandwich was found there, would that be incontrivertable evidence that the pilot was relying solely on a tuna sandwich for IFR flight? In that case, it would of course be incontrovertible that both occupants had the fish and the accident was caused by that. -- Thomas Borchert (EDDH) |
#96
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IFR with a VFR GPS
On Fri, 11 Nov 2005 04:05:09 GMT, John Theune
wrote: What model is this? I've owned a Garmin 195 and Magellan 500 and both started flashing if the lost the signal. I had a older non aviation Gps and as I recall it did not flash when it lost signal. From my experience and that of other pilots I've talked with all the aviation GPS tell you when you lost signal. By the way how does your unit update if you have lost the signal? I can see it freezing and displaying the same info but how would it update? John I have 195. It lets you know when the signal is lost with a message flashing. I also recall from reading the manual that it interpolates position, etc. based on speed & heading at time of signal loss for a short time (x number of seconds?) after loss of signal. If signal loss is momentary it carries on normally. I normally use my 195 plugged into aircraft power and with external antenna. I have noticed that it interferes with the aircraft radio equipment with static and various buzzes depending on frequency selected. It does the same to my car radio when I use it there. I do have some concern that it might interfere with the LOC/GS receiver for instance, but I haven't seen it affect the accuracy when doing practice ILS approaches with the unit on. I have had it go bonkers once when flying very close to VOR Julian (JLI). It gave the lost signal error message, along with bad position & direction display, and would not re-aquire until i powered it down and restarted. |
#97
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IFR with a VFR GPS
On 11/11/2005 08:33, Jose wrote:
Perhaps, but the reason for my reference to the accident in this thread was to support my point that the possibility exists for instrument-rated pilots to use a VFR GPS as the only means of navigation. It is unquestionable that this accident pilot did. It is =not= unquestionable that this accident pilot did. It is known that a VFR GPS was found at the accident site. If a tuna sandwich was found there, would that be incontrivertable evidence that the pilot was relying solely on a tuna sandwich for IFR flight? Perhaps not, but it might come in handy ;-) Sorry, you're response (with which I agree 100%) just made me laugh. Jose -- Mark Hansen, PP-ASEL, Instrument Airplane Sacramento, CA |
#98
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IFR with a VFR GPS
"Peter R." wrote in message ... Perhaps, but the reason for my reference to the accident in this thread was to support my point that the possibility exists for instrument-rated pilots to use a VFR GPS as the only means of navigation. It is unquestionable that this accident pilot did. That's unquestionable only if the VFR GPS was the only nav gear aboard the airplane. I think that unlikely. Since the aircraft struck a tower which was only slightly off the FAC there's no reason to believe a navigational error contributed to this accident. |
#99
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IFR with a VFR GPS
Peter,
is that a lot of (mostly VFR) pilots think that GPS is somehow unreliable, suspect, dodgy, and they stick to the compass+stopwatch method. not here in Germany. -- Thomas Borchert (EDDH) |
#100
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IFR with a VFR GPS
Peter,
Hmm. Data? Or at least some indications? I live here. I'm asking because I live in Germany - and here it isn't as you describe. -- Thomas Borchert (EDDH) |
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