---------------------------------------------------------- Avionics-List Digest Archive --- Total Messages Posted Thu 09/02/04: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:15 AM - Re: Approach GPS () 2. 07:00 AM - Re: Approach GPS () 3. 03:40 PM - Re: Approach GPS Question (T.B.) ________________________________ Message 1 _____________________________________ Time: 05:15:48 AM PST US From: Subject: Avionics-List: Re: Approach GPS --> Avionics-List message posted by: Paul, An IFR certified GPS can only be used to replace ground-based equipment for approach if the FAA has certified an overlay approach. An overlay approach is exactly what you described; you use the GPS to provide course guidance to a ground-based navaid. These are usually identified by the title: VOR *OR* GPS RWYXX, NDB *OR* GPS RWYXX, (emphasis added), etc. I'm unaware of any Localizer overlay approaches. The localizer will theoretically provide more accurate course guidance than the GPS, especially when close to the runway, so nothing is gained by overlaying GPS. I don't know for sure, but I'd be willing to bet that the majority of runways served by a Localizer have some type of GPS approach available. BTW, the FAA doesn't allow you substitute GPS to provide lateral guidance for any ground-based navaids on approach unless it is an overlay approach. You *can* subtitute GPS for required ADF or DME equipment on any approach (except for non-overlay NDB approaches, if the title doesn't contain "GPS" you must have ADF installed and use it for lateral guidance), but not if that equipment is at your required alternate. If you're an AOPA member, you can view this link for more info. http://www.aopa.org/whatsnew/newsitems/1999/991213gps.html Mark > Hi all, > > I have a UPS GX60 and I noticed that it doesn't list any localizer approaches. > I tried simulating one tonight into my local airport (ILS/LOC 10 @ UES) and it > seems to work fine by setting the OBS to 103 degrees as per the approach plate > and intercepting at 45 degrees > > Does any one have any idea why localizer approaches are not part of an approach > certified GPS ? > > Paul > > > > > > > ________________________________ Message 2 _____________________________________ > > > Time: 11:34:17 PM PST US > From: Matt Dralle > Subject: Avionics-List: Official Usage Guideline [Please Read] [Monthly Posting] > DNA: do not archive > > --> Avionics-List message posted by: Matt Dralle > > Dear Lister, > > Please read over the Avionics-List Usage Guidelines below. 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This will only cause a pointless debate that > will hurt feelings, waste bandwidth and resolve nothing. > > ------- > > > [This is an automated posting.] > > > > > > > > > > > > > _- ======================================================================== > _- ======================================================================== > _- ======================================================================== > _- ======================================================================== > > > > > > > --------------------------------------------- This message was sent using Home Telephone Company's Web-Based Email interface. http://webmail.hometel.com ________________________________ Message 2 _____________________________________ Time: 07:00:57 AM PST US From: Subject: Avionics-List: Re: Approach GPS --> Avionics-List message posted by: Paul, An IFR certified GPS can only be used to replace ground-based equipment for approach if the FAA has certified an overlay approach. An overlay approach is exactly what you described; you use the GPS to provide course guidance to a ground-based navaid. These are usually identified by the title: VOR *OR* GPS RWYXX, NDB *OR* GPS RWYXX, (emphasis added), etc. I'm unaware of any Localizer overlay approaches. The localizer will theoretically provide more accurate course guidance than the GPS, especially when close to the runway, so nothing is gained by overlaying GPS. I don't know for sure, but I'd be willing to bet that the majority of runways served by a Localizer have some type of GPS approach available. BTW, the FAA doesn't allow you substitute GPS to provide lateral guidance for any ground-based navaids on approach unless it is an overlay approach. You *can* subtitute GPS for required ADF or DME equipment on any approach (except for non-overlay NDB approaches, if the title doesn't contain "GPS" you must have ADF installed and use it for lateral guidance), but not if that equipment is at your required alternate. If you're an AOPA member, you can view this link for more info. http://www.aopa.org/whatsnew/newsitems/1999/991213gps.html Mark > Hi all, > > I have a UPS GX60 and I noticed that it doesn't list any localizer > approaches. I tried simulating one tonight into my local airport > (ILS/LOC 10 @ UES) and it seems to work fine by setting the OBS to 103 > > degrees as per the approach plate and intercepting at 45 degrees > Does any one have any idea why localizer approaches are not part of an > approach certified GPS? > Paul --------------------------------------------- This message was sent using Home Telephone Company's Web-Based Email interface. http://webmail.hometel.com ________________________________ Message 3 _____________________________________ Time: 03:40:44 PM PST US From: "T.B." Subject: Re: Avionics-List: Approach GPS Question --> Avionics-List message posted by: "T.B." Only actual localizer signals may be used for conducting a localizer approach. Localizers are still more accurate than GPS and you must use the more accurate ground-based signal in order to conduct a localizer approach to the locaizer minimums specified on your chart.