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hobbesmaster
Jan 28, 2008

FrozenVent posted:

how do you feel about sight reduction tables?

do you still have to learn celestial navigation?

i guess it makes sense on a ship; i don't think long haul commercial aircraft even have high enough windows to do it anymore?

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JawnV6
Jul 4, 2004

So hot ...

FrozenVent posted:

if you’re wondering why the distinction is important, see, for example, https://ti.arc.nasa.gov/m/profile/adegani/Grounding%20of%20the%20Royal%20Majesty.pdf

this is incredible, tyvm

my favorite bit so far is the SOL indicator

fishmech
Jul 16, 2006

by VideoGames
Salad Prong

Sagebrush posted:

You literally cannot. It is mathematically impossible. all the GPS receiver knows is the displacement between two subsequent points, and it has no way of determining whether that displacement was because the vehicle pointed in that direction and flew forwards, or if it tried to hover in place and was blown sideways, or any combination in between.

which lets you determine the heading, with sufficient time

Sagebrush posted:

I would just like to point out that I recognize that fishmech thinks they are winning here by getting other people riled up, a la "jokes on them I was only pretending" comic, but I genuinely do enjoy talking about navigational nitpicks like this because they come up a lot as I'm learning to fly planes so it's all cool

i am winning because it's already conclusively proven gps works fine in the arctic or near magnetic poles, which blows apart your dumb post where you stated it doesn't work. the rest is just ya idiots trying to sob about how its slightly difficult to use.

MononcQc
May 29, 2007

FrozenVent posted:

k now imagine the drone is on a treadmill

but how will it take off :smuggo:

mystes
May 31, 2006

Can GPS help this thread navigate out of this derail?

Sagebrush
Feb 26, 2012

ERM... Actually I have stellar scores on the surveys, and every year students tell me that my classes are the best ones they’ve ever taken.

fishmech posted:

which lets you determine the heading, with sufficient time


Richard Feynman posted:

The guy seemed to know what he was doing, and I was sitting there, hanging on
his words, when he said, "And you also have to know about colors--how to get
different colors when you mix the paint. For example, what colors would you mix
to get yellow?"
I didn't know how to get yellow by mixing paints. If it's light, you mix green and
red, but I knew he was talking paints. So I said, "I don't know how you get yellow
without using yellow."
"Well," he said, "if you mix red and white, you'll get yellow."

"Are you sure you don't mean pink?"
"No," he said, "you'll get yellow"--and I believed that he got yellow, because he
was a professional painter, and I always admired guys like that. But I still
wondered how he did it.
I got an idea. "It must be some kind of chemical change. Were you using some
special kind of pigments that make a chemical change?"
"No," he said, "any old pigments will work. You go down to the five-and-ten and
get some paint--just a regular can of red paint and a regular can of white paint--and
I'll mix 'em, and I'll show how you get yellow."
At this juncture I was thinking, "Something is crazy. I know enough about paints to
know you won't get yellow, but he must know that you do get yellow, and
therefore something interesting happens. I've got to see what it is!"
So I said, "OK, I'll get the paints."
The painter went back upstairs to finish his painting job, and the restaurant owner
came over and said to me, "What's the idea of arguing with that man? The man is a
painter; he's been a painter all his life, and he says he gets yellow. So why argue
with him?"
I felt embarrassed. I didn't know what to say. Finally I said, "All my life, I've been
studying light. And I think that with red and white you can't get yellow--you can
only get pink."
So I went to the five-and-ten and got the paint, and brought it back to the
restaurant. The painter came down from upstairs, and the restaurant owner was
there too. I put the cans of paint on an old chair, and the painter began to mix the
paint. He put a little more red, he put a little more white--it still looked pink to me-
-and he mixed some more. Then he mumbled something like, "I used to have a
little tube of yellow here to sharpen it up a bit--then this'll be yellow."
"Oh!" I said. "Of course! You add yellow, and you can get yellow, but you couldn't
do it without the yellow."
The painter went back upstairs to paint.

If the analogy here is not clear to you, I can explain it. Just let me know

FrozenVent
May 1, 2009

The Boeing 737-200QC is the undisputed workhorse of the skies.

fishmech posted:

which lets you determine the heading, with sufficient time

no because the external input vector varies over time and you have no way to measure it because your point of reference is moving in a way you cannot assess independently of the external input vector because you are not measuring heading

seriously dude

hobbesmaster posted:

do you still have to learn celestial navigation?

yes but I’m a ship guy

we all had to go up on the roof of the school with sextants and figure out how high the sun was over the church steeple (because there horizon was blocked by the drat church)

also sight reduction table are easy mode bs and if you use them on a ship lol just lol

Jonny 290
May 5, 2005



[ASK] me about OS/2 Warp

President Beep posted:

they’d have to find each other first.

lol

post hole digger
Mar 21, 2011

President Beep posted:

they’d have to find each other first.

haha

Roosevelt
Jul 18, 2009

Tony Pizzuto Says Hello
lol fishmech got banned again

FrozenVent
May 1, 2009

The Boeing 737-200QC is the undisputed workhorse of the skies.
noooooooooo! I was this close to getting them to admit they were wrong!!!!

drat you fishmech! drat you to hell!

infernal machines
Oct 11, 2012

we monitor many frequencies. we listen always. came a voice, out of the babel of tongues, speaking to us. it played us a mighty dub.

Roosevelt posted:

lol fishmech got banned again

and weirdly, not even for this


FrozenVent posted:

noooooooooo! I was this close to getting them to admit they were wrong!!!!

drat you fishmech! drat you to hell!

don't worry, fishmech will return

he always does

JawnV6
Jul 4, 2004

So hot ...
if boston is such a poo poo-tier shoal-infested harbor why don't they have harbor pilots? or was the grounding outside of their area of effect

fishmech
Jul 16, 2006

by VideoGames
Salad Prong

FrozenVent posted:

no because the external input vector varies over time and you have no way to measure it because your point of reference is moving in a way you cannot assess independently of the external input vector because you are not measuring heading

seriously dude


yes but I’m a ship guy

we all had to go up on the roof of the school with sextants and figure out how high the sun was over the church steeple (because there horizon was blocked by the drat church)

also sight reduction table are easy mode bs and if you use them on a ship lol just lol

in fact you can determine your heading from gps.

Sagebrush
Feb 26, 2012

ERM... Actually I have stellar scores on the surveys, and every year students tell me that my classes are the best ones they’ve ever taken.
that was fast.

FrozenVent
May 1, 2009

The Boeing 737-200QC is the undisputed workhorse of the skies.

JawnV6 posted:

if boston is such a poo poo-tier shoal-infested harbor why don't they have harbor pilots? or was the grounding outside of their area of effect

it was outside the pilotage area

pilots usually work on visual cues, so they’re not as affected by electronic navigation issues, but... they gently caress up on the regular too

FrozenVent
May 1, 2009

The Boeing 737-200QC is the undisputed workhorse of the skies.

fishmech posted:

in fact you can determine your heading from gps.

no you cannot

President Beep
Apr 30, 2009





i have to have a car because otherwise i cant drive around the country solving mysteries while being doggedly pursued by federal marshals for a crime i did not commit (9/11)
can’t squish the fish

FrozenVent
May 1, 2009

The Boeing 737-200QC is the undisputed workhorse of the skies.

fishmech posted:

in fact you can determine your heading from gps.

this is “actually the sky is green” level of wrong

fishmech
Jul 16, 2006

by VideoGames
Salad Prong

FrozenVent posted:

no you cannot

yep, you can!

FrozenVent
May 1, 2009

The Boeing 737-200QC is the undisputed workhorse of the skies.

fishmech posted:

yep, you can!

please explain how

JawnV6
Jul 4, 2004

So hot ...

FrozenVent posted:

it was outside the pilotage area

pilots usually work on visual cues, so they’re not as affected by electronic navigation issues, but... they gently caress up on the regular too
oic, sf's starts out at the farallones 30+ miles out, thought boston could afford that kinda classy setup

fishmech
Jul 16, 2006

by VideoGames
Salad Prong

FrozenVent posted:

please explain how

track your locations over time and compare it.

FrozenVent
May 1, 2009

The Boeing 737-200QC is the undisputed workhorse of the skies.

JawnV6 posted:

oic, sf's starts out at the farallones 30+ miles out, thought boston could afford that kinda classy setup

doesn’t SF have sandbanks all the way out?

pilots are hella expensive they make your port uncompetitive if you have them out too far

fishmech posted:

track your locations over time and compare it.

that’s course over ground, not heading

Suspicious Dish
Sep 24, 2011

2020 is the year of linux on the desktop, bro
Fun Shoe

fishmech
Jul 16, 2006

by VideoGames
Salad Prong

FrozenVent posted:


that’s course over ground, not heading

which allows you to determine what heading you must have

Godholio
Aug 28, 2002

Does a bear split in the woods near Zheleznogorsk?

fishmech posted:

and you can determine that from the gps data. it is simply harder.

HEADING IS NOT NECESSARILY DIRECTION OF TRAVEL

haveblue
Aug 15, 2005



Toilet Rascal
gpiss

graph
Nov 22, 2006

aaag peanuts

Suspicious Dish
Sep 24, 2011

2020 is the year of linux on the desktop, bro
Fun Shoe

fishmech
Jul 16, 2006

by VideoGames
Salad Prong

Godholio posted:

HEADING IS NOT NECESSARILY DIRECTION OF TRAVEL

it allows you to determine your heading

Feisty-Cadaver
Jun 1, 2000
The worms crawl in,
The worms crawl out.
can we talk about microwaves some more?

my parents got a microwave I think from my mom's parents as a wedding present when they got married in 1970-whatever and they still have it and it still works great

its brown.

Godholio
Aug 28, 2002

Does a bear split in the woods near Zheleznogorsk?

fishmech posted:

it allows you to determine your heading

If I face 360 but move 180, what will GPS tell me?

graph
Nov 22, 2006

aaag peanuts
is it tonkatsu or is it schnitzel ?!

M_Gargantua
Oct 16, 2006

STOMP'N ON INTO THE POWERLINES

Exciting Lemon

Sagebrush posted:

I would just like to point out that I recognize that fishmech thinks they are winning here by getting other people riled up, a la "jokes on them I was only pretending" comic, but I genuinely do enjoy talking about navigational nitpicks like this because they come up a lot as I'm learning to fly planes so it's all cool

i agree that fishmech is wrong on a gross conceptual error level

now let me tell you about navigation via signals of opportunity like cell towers or radio stations broadcasting from kuwait city. fixed reference ekelund ranging based on assumptions

still better than trying to get true bearing off of gps

MononcQc
May 29, 2007

fishmech posted:

in fact you can determine your heading from gps.

wish you'd find your heading to gbs

graph
Nov 22, 2006

aaag peanuts
hell yeah

graph
Nov 22, 2006

aaag peanuts
do you go for the cocktail sauce or do you go for the straight up fresh lemon juice

haveblue
Aug 15, 2005



Toilet Rascal

Godholio posted:

If I face 360 but move 180, what will GPS tell me?

it tells you there’s an Xbox in front of you

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President Beep
Apr 30, 2009





i have to have a car because otherwise i cant drive around the country solving mysteries while being doggedly pursued by federal marshals for a crime i did not commit (9/11)
the wonder bread years, starring bread savage

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