Looking for the Source of Information, ATIS, AWOS, ASOS,

Ok,,, so it' been known to pilots that ATIS reports are based off of
magnetic heading: AWOS, ASOS, FB WINDS (Winds Aloft) are based on true
heading. The question is, where in the FAA publication does it say
that? I looked through FAA's PHAK, AIM, and AC00-45F, but none of
them indicated anything about the heading.

AIM 4-1-13: "ATIS information includes the time of the latest weather
sequence, ceiling, visibility, obstructions to visibility, temperature, dew
point (if available), wind direction (magnetic) ... "

AIM 4-2-10: "The three digits of bearing, course, heading, or wind direction
should always be magnetic. The word "true" must be added when it applies."

AIM 7-1-12 d3 (Note): "Wind direction broadcast over FAA radios is in
reference to magnetic north."

AIM 7-1-12 d5 Fig 7-1-8 (METAR): "WIND DIRECTION AND SPEED. Direction in
tens of degrees from true north (first three digits) ..."

PHAK Ch 11 TAF: "Forecast Wind - The wind direction and speed forecast are
given in a five-digit number group. The first three indicate the direction
of the wind in reference to true north. ..."

PHAK Ch 11 Winds Aloft: "Wind direction is always in reference to true north
...."

There's more, but this ought to be sufficient.

Regards,

Jon

"Hiro" wrote in message
...
Ok,,, so it' been known to pilots that ATIS reports are based off of
magnetic heading: AWOS, ASOS, FB WINDS (Winds Aloft) are based on true
heading. The question is, where in the FAA publication does it say
that? I looked through FAA's PHAK, AIM, and AC00-45F, but none of
them indicated anything about the heading.

Hiro wrote:

Ok,,, so it' been known to pilots that ATIS reports are based off of
magnetic heading: AWOS, ASOS, FB WINDS (Winds Aloft) are based on true
heading. The question is, where in the FAA publication does it say
that? I looked through FAA's PHAK, AIM, and AC00-45F, but none of
them indicated anything about the heading.


Wind broadcast on ATIS, AWOS, and ASOS is magnetic.

Hiro wrote

I looked through FAA's PHAK, AIM, and AC00-45F, but none of
them indicated anything about the heading.

And..of course, (pun intended) wind does not have "heading",
just a "direction from". Aircraft and ships have heading.

Bob Moore

Robert Moore wrote:
Hiro wrote

I looked through FAA's PHAK, AIM, and AC00-45F, but none of
them indicated anything about the heading.

And..of course, (pun intended) wind does not have "heading",
just a "direction from". Aircraft and ships have heading.

Bob Moore
You know, that's your point of view. The wind sees things very
differently, I can assure you.

On Feb 11, 5:25*am, "Steven P. McNicoll"
wrote:
Hiro wrote:

Wind broadcast on ATIS, AWOS, and ASOS is magnetic.

Wow that's what I thought too. But the AIM 7-1-12 most definitely is
saying that it is in true (or is that a typo?). Of course the
variance around here is around 2 degrees, which given how touchy the
AWOS at my airport is, seems to be is pretty negligible. Glad someone
brought it up before I have a question about it on my written though.
That would have been a silly question to miss.

Scien wrote:
On Feb 11, 5:25 am, "Steven P. McNicoll"
wrote:
Hiro wrote:

Wind broadcast on ATIS, AWOS, and ASOS is magnetic.


Wow that's what I thought too. But the AIM 7-1-12 most definitely is
saying that it is in true (or is that a typo?). Of course the
variance around here is around 2 degrees, which given how touchy the
AWOS at my airport is, seems to be is pretty negligible. Glad someone
brought it up before I have a question about it on my written though.
That would have been a silly question to miss.


I don't see the word "true" anywhere in AIM 7-1-12. The NOTE in AIM
7-1-12.d.3. states, "Wind direction broadcast over FAA radios is in
reference to magnetic north."

On Feb 11, 11:29*am, Scien wrote:
On Feb 11, 5:25*am, "Steven P. McNicoll"
wrote:

Hiro wrote:

Wind broadcast on ATIS, AWOS, and ASOS is magnetic.

Wow that's what I thought too. *But the AIM 7-1-12 most definitely is
saying that it is in true (or is that a typo?). *Of course the
variance around here is around 2 degrees, which given how touchy the
AWOS at my airport is, seems to be is pretty negligible. *Glad someone
brought it up before I have a question about it on my written though.
That would have been a silly question to miss.

Um, with it being AWOS, since I was being unclear.

On Feb 11, 1:30*am, "Jon Woellhaf" wrote:
AIM 4-1-13: "ATIS information includes the time of the latest weather
sequence, ceiling, visibility, obstructions to visibility, temperature, dew
point (if available), wind direction (magnetic) ... "

AIM 4-2-10: "The three digits of bearing, course, heading, or wind direction
should always be magnetic. The word "true" must be added when it applies."

AIM 7-1-12 d3 (Note): "Wind direction broadcast over FAA radios is in
reference to magnetic north."

AIM 7-1-12 d5 Fig 7-1-8 (METAR): "WIND DIRECTION AND SPEED. Direction in
tens of degrees from true north (first three digits) ..."

PHAK Ch 11 TAF: "Forecast Wind - The wind direction and speed forecast are
given in a five-digit number group. The first three indicate the direction
of the wind in reference to true north. ..."

PHAK Ch 11 Winds Aloft: "Wind direction is always in reference to true north
..."

There's *more, but this ought to be sufficient.

Regards,

Jon

"Hiro" wrote in message

...

Ok,,, so it' been known to pilots that ATIS reports are based off of
magnetic heading: AWOS, ASOS, FB WINDS (Winds Aloft) are based on true
heading. *The question is, where in the FAA publication does it say
that? *I looked through FAA's PHAK, AIM, and AC00-45F, but none of
them indicated anything about the heading.

Thank you Jon. Your information was VERY helpful. There have been a
lot of information from people, but I don't trust anything besides the
FAA's publication...

Jon Woellhaf wrote:

ATIS ... magnetic
broadcast over FAA radios ... magnetic
METAR: ... true
TAF: ... true
Winds Aloft: ... true

Which makes a lot of sense, actually. True for planning, magnetic when
on short final.