FAR Part 97: Aircraft Approach Categories - IAS vs Ground Speed

wrote in message ...

The values are there to be used as IAS or ground speed; it is pilot
option.


How can that be an option? There can be significant differences between
them.



Jeppesen is making an assumption that is not a regulatory charting value.


If the values are the same on NACO and Jeppesen charts, and if Jeppesen uses
GS as you say, then it should be clear that NACO uses GS as well.

Whatever made you think they were IAS anyway?

"Roy Smith" wrote in message
...

Oh, come on, this is getting silly. The table is labeled (for example, on
the HPN NDB 16) "FAF to MAP 4.8 NM". That's one point on the ground to
another point on the ground.


Well, the NDB is on the ground, nut the MAP is in the air! : )

"Steven P. McNicoll" wrote in
k.net:


"Roy Smith" wrote in message
...

Oh, come on, this is getting silly. The table is labeled (for
example, on the HPN NDB 16) "FAF to MAP 4.8 NM". That's one point on
the ground to another point on the ground.


Well, the NDB is on the ground, nut the MAP is in the air! : )


Actually, technically speaking, the MAP is a fixed point in space that
happens to be physically above the ground. Howver, it is a fixed point at a
fixed altitude and at a fixed position relative to objects on the ground.

The real question here is, does the NACO chart take into consideration the
relative motion of the earth along it's axis when calculating ground speed?
And if so, do the times change based on the season?

wrote in :


In recent years, RNAV has all-but-eliminated any need to use the
timing table in any case.


Assuming, of course, that your plane has an IFR-approved GPS that is
currently working.

In article ,
Judah wrote:

"Steven P. McNicoll" wrote in
k.net:


"Roy Smith" wrote in message
...

Oh, come on, this is getting silly. The table is labeled (for
example, on the HPN NDB 16) "FAF to MAP 4.8 NM". That's one point on
the ground to another point on the ground.


Well, the NDB is on the ground, nut the MAP is in the air! : )


Actually, technically speaking, the MAP is a fixed point in space that
happens to be physically above the ground. Howver, it is a fixed point at a
fixed altitude and at a fixed position relative to objects on the ground.

The real question here is, does the NACO chart take into consideration the
relative motion of the earth along it's axis when calculating ground speed?
And if so, do the times change based on the season?

Don't forget continental drift.

Actually, technically speaking, the MAP is a fixed point in space that
happens to be physically above the ground.

Actually, technically speaking the MAP is a moving point in space that
happens to be (defined to be) moving at the same rate as the ground.

flee Jose
--
Nothing takes longer than a shortcut.
for Email, make the obvious change in the address.

"Jose" wrote in message
news

Actually, technically speaking, the MAP is a fixed point in space that
happens to be physically above the ground.


Actually, technically speaking the MAP is a moving point in space that
happens to be (defined to be) moving at the same rate as the ground.


That would make it a fixed point in reference to the earth. Frame of
reference, dear boy, frame of reference.

Frame of
reference, dear boy, frame of reference.

Precisely. The poster didn't give one.

Jose
--
Nothing takes longer than a shortcut.
for Email, make the obvious change in the address.

My CFII didn't really understand holds. He knew how to enter them and
fly them. But he didn't know how ATC called them out and had some other
misunderstandings about them. But, him not knowing the facts on this
subject made ME research holds and other related subjects, so I'll
NEVER forget them now!!

"Jose" wrote in message
...

Precisely. The poster didn't give one.


Yes he did.