Dave S wrote:


Newps wrote:

Not required. You just need to have any fix of the approach in the
database.


Usually I agree with you, but I am confused here.

Why WOULDN'T you need the physical location of the DME in the database,
if you are using the distance from that location as the basis of
whatever decision you were using the DME for?

I know that your answers are always light on the "why" part of the
answer, but just once do you think you can throw the why in? as well as
a reference, because I am unfamiliar with the rationale for your answer.

I'm not newps, but if you have some fix that's along the approach in the
database, you can use the distance to that fix, and use mental arithmetic to
calculate the distance to the DME station.

At one time this was more common before the ILS/DME locations were included in
the databases. I don't have a cite, but believe it's all spelled out in the AIM
(assuming US).