Why The Hell... (random rant)

writes:

Maybe, just maybe, the satellites on the other side of the planet, but
for everything in view, seconds.

The satellites take twelve hours to orbit the planet, and they don't pass over
the same spots on each orbit. As I recall, it takes several hours to have
them all execute a command, although that may be changing in future blocks.

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Mxsmanic wrote:


GPS finds true north. And, just incidentally, you can find true north by
looking at the sky.


LOL! How do _you_ do that exactly?

Cheers

DR writes:

LOL! How do _you_ do that exactly?

I don't. I know the direction of true north at my location, and I don't go
anywhere else.

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Mxsmanic wrote:
DR writes:

LOL! How do _you_ do that exactly?

I don't. I know the direction of true north at my location, and I don't go
anywhere else.

This is perhaps not only the truth, but the telling story of your
problem.

You don't go anywhere else.

Mxsmanic wrote:
writes:

A sensor to find true north in an airplane in flight doesn't exist.

GPS finds true north.

Nope, GPS finds a 3-d position based on the relative distances between
sets of satellites in geosynchronous orbit. It knows no more about
true north than magnetic without elaborate conversion between where
the satellites are at any given instant and where the earth is.

And, just incidentally, you can find true north by
looking at the sky. ANS will do that, and people can do it, too.

Funny, I'm looking at the sky today and all I see are clouds.
My compass still works.


The isogonic lines on a chart take care of all the problems of where
the actual north/south magnetic poles are.

Documenting them doesn't really eliminate them.

It gives you the tool, just like your beloved GPS knows how to find
the real north pole between the combination of the downloaded data
on where the satellites are and a substantial amount of information
on the shape of the earth inside it's internal database.


Unless the airplane is a glider, you have power.

You are clueless aren't you. The engine in just about every airplane
out there runs just freaking fine without any electrical power consumed
nor delivered to the rest of the aircraft.

One third correct: it requires power, but engines provide power. It doesn't
have to be set up against anything else to find true north. It doesn't need
to be constantly updated; the whole idea is to be fairly autonomous.


You are clueless. Your GPS is constantly updated or it won't work.
You put the thing in a box for a week or so or power it up in an
undisclosed location and it will DO NOTHING for you until it downloads
enough information to continue.

Ron Natalie writes:

Nope, GPS finds a 3-d position based on the relative distances between
sets of satellites in geosynchronous orbit.

Roughly, yes.

It knows no more about
true north than magnetic without elaborate conversion between where
the satellites are at any given instant and where the earth is.

With two fixes, it has true north. If it's moving, it has at least two fixes.

Funny, I'm looking at the sky today and all I see are clouds.
My compass still works.

There are lots of places on Earth where your compass won't work, but an ANS
will.

You are clueless aren't you. The engine in just about every airplane
out there runs just freaking fine without any electrical power consumed
nor delivered to the rest of the aircraft.

Are they all Diesels?

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In rec.aviation.piloting Mxsmanic wrote:
Ron Natalie writes:

Nope, GPS finds a 3-d position based on the relative distances between
sets of satellites in geosynchronous orbit.

Roughly, yes.

It knows no more about
true north than magnetic without elaborate conversion between where
the satellites are at any given instant and where the earth is.

With two fixes, it has true north. If it's moving, it has at least two fixes.

And that tells you your course, not which direction the nose is pointed.

There is no GPS instrument available that will tell you which way
your nose is pointed.

Funny, I'm looking at the sky today and all I see are clouds.
My compass still works.

There are lots of places on Earth where your compass won't work, but an ANS
will.

The only two places on Earth a magnetic compass doesn't work in an
airplane are over the north and south magnetic poles.

You really are ignorant, aren't you?

You are clueless aren't you. The engine in just about every airplane
out there runs just freaking fine without any electrical power consumed
nor delivered to the rest of the aircraft.

Are they all Diesels?

Good lord.

Ignorant doesn't even begin to describe how totally, utterly, and
completely clueless you are.

Piston engines have magnetos which generate the spark plug firing
voltage, and only the spark plug voltage. The engine has no other
need for electrical power and doesn't generate electrical power
to run things like GPS unless it has a generator or an alternator
installed. Many airplanes have neither a generator or an alternator.

Turbine engines only require electrical power to start. Once they
are running, they are self sustaining.

If you are going to be a pretend pilot, at least go learn some
basics so you don't look like a complete fool.

--
Jim Pennino

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writes:

And that tells you your course, not which direction the nose is pointed.

For navigation, your ground track is more important.

There is no GPS instrument available that will tell you which way
your nose is pointed.

As I've said, you just use two.

The only two places on Earth a magnetic compass doesn't work in an
airplane are over the north and south magnetic poles.

No. There are thousands of local magnetic anomalies that can make a compass
useless.

Piston engines have magnetos which generate the spark plug firing
voltage, and only the spark plug voltage.

Last time I checked, sparks counted as electricity.

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"Mxsmanic" wrote in message
...
writes:

And that tells you your course, not which direction the nose is pointed.

For navigation, your ground track is more important.

There is no GPS instrument available that will tell you which way
your nose is pointed.

As I've said, you just use two.

The only two places on Earth a magnetic compass doesn't work in an
airplane are over the north and south magnetic poles.

No. There are thousands of local magnetic anomalies that can make a
compass
useless.

Piston engines have magnetos which generate the spark plug firing
voltage, and only the spark plug voltage.

Last time I checked, sparks counted as electricity.


Then hook up a spark plug wire to your GPS.

In rec.aviation.piloting Maxwell wrote:

"Mxsmanic" wrote in message
...
writes:

And that tells you your course, not which direction the nose is pointed.

For navigation, your ground track is more important.

There is no GPS instrument available that will tell you which way
your nose is pointed.

As I've said, you just use two.

The only two places on Earth a magnetic compass doesn't work in an
airplane are over the north and south magnetic poles.

No. There are thousands of local magnetic anomalies that can make a
compass
useless.

Piston engines have magnetos which generate the spark plug firing
voltage, and only the spark plug voltage.

Last time I checked, sparks counted as electricity.


Then hook up a spark plug wire to your GPS.

Better to his forehead; electroshock therapy sounds like it is called
for in his case.

--
Jim Pennino

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