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

[Hiro]

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.

[Jon Woellhaf]

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.

[Steven P. McNicoll[_2_]]

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.

[Robert Moore]

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

[Tman[_2_]]

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.

[Scien]

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.

[Steven P. McNicoll[_2_]]

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."

[Scien]

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.

[Hiro]

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...

[John Smith]

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.

[Jon Woellhaf]

You're welcome, Hiro.

Hiro wrote, "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..."

[Scien]

On Feb 11, 11:53*am, "Steven P. McNicoll" >
wrote:
> 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."

Um, sorry. I think you are right kinda. The figure later in that AIM
says:

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) ..."