Jepp vs NOS at PRB

On 05 May 2004 22:34:39 GMT, (Teacherjh) wrote:


Lastly, it beats the hell out of me why anybody would care that DIYAD is
13.5 DME from HUO. Given the crossing angles, I could see that being on
the localizer and 20.8 DME from SAX is a good way to identify NISSN, but
being on the localizer and being 13.5 DME from HUO is pretty worthless
as a way to identify DIYAD. GPS is wonderful :-)

Diyad is also on the LOC.


Yes, it is. And the best information from the localizer is "left or right of
course", which translates roughly into "too far East, too far West". To
augment this and get an actual location, you need something whose best
information is "too far North, too far South. DME from SAX does this (since
SAX is roughly South). DME from the LOC (if it's available) is even better.
However, DME from HUO (which is to the West) is going to tell you "too far
West, too far East".

But you already know this from the localizer.

Jose

According to my interpretation of the Jepp chart, DIYAD is formed by the
intersection of the HUO 094R and the LOC; or by the 13.5DME point on the
HUO 094R


Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)

In article ,
Ron Rosenfeld wrote:

According to my interpretation of the Jepp chart, DIYAD is formed by the
intersection of the HUO 094R and the LOC; or by the 13.5DME point on the
HUO 094R

Yes. I get the same from reading the NOS chart, so at least we're both
on the same page.

But, what I don't understand is what value it is knowing that DIYAD is
13.5 DME from HUO. The only real reason DIYAD exists is to specify a
fixed distance out on the localizer course, and HUO DME doesn't help you
do that.

According to my interpretation of the Jepp chart, DIYAD is formed by the
intersection of the HUO 094R and the LOC; or by the 13.5DME point on the
HUO 094R


Yes, that is true. And the DME distance might be useful to someone coming in
from HUO. However, the DME (and not the radial) is charted in the plan view.
If they are going to go through the trouble (and clutter) of putting the DME
there, I'd rather see the radial. Especially since the same VOR (different
radial) is used to identify NISSN.

Jose

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