Do I need DME or ADF in an IFR-certified GPS panel?

Matt,

My guess is that you'll
find more GPS approaches that require DME than require ADF.


but how many would there be where the GPS could not legally replace the
DME? Those are only the very few where the DME is not in the database.

--
Thomas Borchert (EDDH)

Thomas Borchert wrote:

but how many would there be where the GPS could not legally replace the
DME? Those are only the very few where the DME is not in the database.

It's my understanding that the DME box in the plane measures distance from a
VOR. All VORs should be in the database.

George Patterson
Why do men's hearts beat faster, knees get weak, throats become dry,
and they think irrationally when a woman wears leather clothing?
Because she smells like a new truck.

On 6/8/2005 09:51, George Patterson wrote:

Thomas Borchert wrote:

but how many would there be where the GPS could not legally replace the
DME? Those are only the very few where the DME is not in the database.

It's my understanding that the DME box in the plane measures distance from a
VOR. All VORs should be in the database.

Actually, it measures distance from a DME or TACAN facility, not from
a VOR. It can use a VOR/DME or VORTAC, but not a VOR.


George Patterson
Why do men's hearts beat faster, knees get weak, throats become dry,
and they think irrationally when a woman wears leather clothing?
Because she smells like a new truck.


--
Mark Hansen, PP-ASEL, Instrument Student
Sacramento, CA

George Patterson wrote:
Thomas Borchert wrote:


but how many would there be where the GPS could not legally replace
the DME? Those are only the very few where the DME is not in the
database.


It's my understanding that the DME box in the plane measures distance
from a VOR. All VORs should be in the database.

There are ILS based DME's. The issue isn't GPS appraoches, it's
using a GPS to substitute for DME on another non-GPS approach.

George Patterson wrote:
It's my understanding that the DME box in the plane measures distance from a
VOR. All VORs should be in the database.

Not all DME ground stations are co-located with VORs. Many are on
airports as part of an ILS-DME (and the exact location of the ground
station is not charted in that case).

If you look hard enough, you can find the occasional NDB-DME station.
I'm not aware of any stand-alone DME ground stations, but I can't
think of any reason why such a thing couldn't exist.

Roy Smith wrote:

If you look hard enough, you can find the occasional NDB-DME station.
I'm not aware of any stand-alone DME ground stations, but I can't
think of any reason why such a thing couldn't exist.

There are probably some TACAN only stations around somewhere, but I'm
not sure any civil procedures would use them.

KEFD (ellington field) has some DME arcs on its TERPS that are based on
an on-field TACAN. Once upon a time this was a VORTAC, but its been a
TACAN only for at least the past 5 years, prolly closer to 10.

the ILS 17R is one of em. The Govt charts list the TACAN/DME chan as
31.. by having the jepp charts, you can know the freq as 109.4 mhz.

I use the DME routinely just to know distance to the field in non-gps
planes.

Dave


Ron Natalie wrote:

Roy Smith wrote:

If you look hard enough, you can find the occasional NDB-DME station.
I'm not aware of any stand-alone DME ground stations, but I can't
think of any reason why such a thing couldn't exist.

There are probably some TACAN only stations around somewhere, but I'm
not sure any civil procedures would use them.

Thomas Borchert wrote:
Matt,


My guess is that you'll
find more GPS approaches that require DME than require ADF.



but how many would there be where the GPS could not legally replace the
DME? Those are only the very few where the DME is not in the database.


There are no GPS appraoches that require DME period. It's not a
matter of "replacing" it.

The only issue is using GPS to substitute for DME on NON-GPS
approaches. You can do that if you have the fix AND this isn't
the non-GPS required alternate.