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Subject:Re: Will GPS ever really replace ADF/DME?
From:Scott Moore
Date:Fri Oct 04 08:25:21 2002
Interesting, I am not a lawyer, so Ill concede this one.

"Steven P. McNicoll" wrote:
>
> >From: "Robert Henry" nospam@cox.net
> >Date: 10/3/02 7:27 AM Central Daylight Time
> >Message-id:
> >
> >Please explain. Ive flown that approach at least three times using GPS for
> >DME.
> >
>
> See AIM 1-1-21.f.6.(f):
>
> "Charted requirements for ADF and/or DME can be met using the GPS system,
> except for use as the principal instrument approach navigation source."
>
> In the overwhelming majority of VOR/DME approaches, (in fact, in every other
> one that Im aware of), VOR provides course guidance and DME provides
> along-track distance. But the VOR/DME RWY 15 at MTN is just the opposite,
> course guidance is provided by a DME arc and along track distance is
> indicated by crossing radials. DME provides the principal instrument
> approach navigation source on this particular SIAP, so GPS cannot substitute
> for DME on this approach. Its the same situation you have with an NDB
> approach where there is no GPS overlay.

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