REFLECTOR:Nav Requirements

[Scott]

Actually there is an additional requirement.

The OM or IM or ILS antenna location or what ever location on the approach 
your trying to DME from must be in your database, meaning it must be a 
named fix or you know the Lat/Longs for it and have entered it into the 
GPS's data base.  Problem is a lot of ILS's and some LOC approaches have 
the DME  co-located with the ILS antenna and that location is not published 
as a named fix or lat/long.  Unless there is some other fix on the approach 
that you can compute the distance form you SOL.

Also the GPS MUST BE in approach mode, not terminal or enroute mode,  this 
enable RAIM and also puts the GPS in its most sensitive output mode so full 
deflection is 1/8 mile or something like that..  You have to manually put 
it in Approach mode if using it for a non-GPS approach.

Scott

At 01:34 PM 1/16/2004, you wrote:
>You can now use a GPS for the DME portion of an approach IF it is IFR 
>certafied. I saw a recent FAA blurb that said you can also use the GPS to 
>identify the OM on an IFR approach, as long as you have the VOR/ILS to 
>shoot the remainder of the approach.
>
>Most of the NDB approaches that I am familiar with have a GPS overlay, or 
>it is in the works.
>
>
>Kurt Winker
>Albuquerque ARTCC.