Jump to content

Sign in to follow this  
RamonB

Perhaps we should learn to use a Sextant!

Recommended Posts

Posted (edited)

The Air Force May Ditch GPS for Earth's Magnetic Field

"One idea that seemingly holds a lot of promise: magnetic anomaly navigation techniques, or MAGNAV."

Just stumbled into this article. Found it interesting.

I don't want to ditch my GTN750

Your thoughts?
 

Cheers.

Edited by RamonB
  • Like 1
  • Upvote 1

Ramón.
Time, is the one thing no one can buy.
ovbe94a9nab0bbc6g.jpg

 

Share this post


Link to post

I saw the headline and wondered if it was from The Onion. 😄 

I suspect inertial navigation systems will be in use if the GPS goes down.  They were already in use before the GPS came up, and they are probably more accurate then the technology described in that article.  Especially if you are equipped with three of them... if one gives a reading far off from the other two you discard it and turn that INS off.

Hook

  • Like 1
  • Upvote 1

Larry Hookins

 

Oh! I have slipped the surly bonds of Earth
And danced the skies on laughter-silvered wings;

Share this post


Link to post
Quote

The Pentagon’s reliance on GPS has made its disruption or destruction the number one priority by adversaries in wartime.

Oh, you think?? :ph34r: :biggrin:

I often wonder about the chaos caused if and when someone flicks the off switch to GPS satellites, although there are other nav satellites in orbit which aren't American. (GLONASS etc.)

There's a freeware sextant add-on for flightsims if one wants to practice a little.

I guess we'll have to go back to buying paper maps for car travel 🍻

Isn't the Earth's mag field subject to changes - MAGVAR? which would mean that updates would be required?

Airliners did ok on INS for quite some time didn't they? Even at Mach 2 :wink:

  • Like 1
  • Upvote 1

Mark Robinson

"What's it doing now?"

Author of FLIGHT: A near-future short story (ebook available on amazon)

I made the baby cry - A2A Simulations L-049 Constellation

Sky Simulations MD-11 V2.2 Pilot. The best "lite" MD-11 money can buy (well, it's not freeware!)

Share this post


Link to post

GPS is quite often disrupted (deliberately) over the North Sea for the purposes of military exercises, (and I think to annoy Tu95 pilots too). You see NOTAMS about it from time to time telling you to be ready to use other navigational techniques including VORs, ded reckoning etc.

  • Upvote 1

Alan Bradbury

Check out my youtube flight sim videos: Here

Share this post


Link to post

[OT]

"Dead reckoning: you reckon correctly, or you're dead."

  • Like 1

"The problem with quotes on the Internet is that it is hard to verify their authenticity." [Abraham Lincoln]

Share this post


Link to post

Taking out satellites would be an early move in a future war, therefore yes you can't depend on the high tech for too long. It maybe low tech but it is good tech 😎

  • Upvote 1

Matthew Kane

 

Share this post


Link to post

Bring back LORAN!

  • Like 1
  • Upvote 1

Boeing777_Banner_Pilot.jpg

James M Driskell, Maj USMC (Ret)

 

 

Share this post


Link to post

In the sixty`s we used the sun compass on the top of the vehicle in the Sahara, we did not have GPS back then.

  • Like 1

i9 10900K\ASUS APEX MB \ MSI RTX 2080Ti GAMINGX TRIO \ M.2  Samsung 970 EVO Plus 1TB C Drive \ 2+1TB Samsung 850 EVO \ 2TB BarraCuba \ 32GB G.SKILL Z DDR4 3600MHZ \ Windows 10 Home\ ASUS 28" 4K monitor\ 4TB Portable Drive\P3DV5

Raymond Fry.

PMDG_Banner_747_Enthusiast.jpg

Share this post


Link to post

"With the sextant he made obeisance to the sun-god, he consulted ancient tomes and tables of magic characters, muttered prayers in a strange tongue that sounded like Indexerrorparallaxrefraction, made cabalistic signs on paper, added and carried one, and then, on a piece of holy script called the Grail – I mean, the Chart – he placed his finger on a certain space conspicuous for its blankness and said, “Here we are.” When we looked at the blank space and asked, “And where is that?” he answered in the cipher-code of the higher priesthood, “31 -15 – 47 north, 133 – 5 – 30 west.” And we said, “Oh,” and felt mighty small."

Jack London

  • Like 6
  • Upvote 1

Klaatu barada nickto

Share this post


Link to post

Not politically correct here.

 


Frank Patton
MSI Z490 WiFi MOB;  i7 10700 3.8 Ghz CPU; Ripjaws 32 gb DDR4 3600; ASUS GTX 1070 TI Turbo 8GB; MasterCase H500M; Corsair H100i Pro cooler; Corsair RMX850X PSU; ASUS VG289 4K 27"; Former USAF meteorologist & ground weather school instructor; AOPA Member #07379126 
                        There is no limit to what a man can do or where he can go if he doesn’t mind who gets the credit! - Benjamin Jowett

 

Share this post


Link to post

Our company operated two Learjets in the 1980's, for long range navigation one was equipped with Loran C and the other using a Collins LRN-85 VLF Omega unit. Both units were certified for IFR enroute operation with 2NM accuracy. They worked very well and you would transition to VOR/DME  or yes, NDB  ground based sources as required in the terminal environment. The aviation world got along just fine using paper charts, basic nav systems and your own situational awareness. I can't imagine the panic today if GPS systems so widely in use in everyday life were to suddenly be disabled. I have played around with the Davis plastic training sextant for fun and it takes practice but makes one admire the skills of a qualified navigator. 

  • Upvote 1

Gary Stewart

Share this post


Link to post

I think now a days we could have automatic sextant just like one on space probs.

It would be quite accurate with atomic clock and when flying above the cloud.

 

BTW there is one problem with celestial navigation in FS (at lest P3D), without proper simulation on atmosphere extinction and the limitation of a monitor, it's quite hard to tell the difference between magnitudes, it's even harder to find the constellation in FS than in the real word as there are so many 4+ stars too visable in the virtual sky.

  • Upvote 1

Share this post


Link to post
3 hours ago, C2615 said:

I think now a days we could have automatic sextant just like one on space probs.

You could probably get a smart phone app to do that, not as accurate though


Matthew Kane

 

Share this post


Link to post
8 hours ago, fppilot said:

Not politically correct here.

 

What's not politically correct?


Klaatu barada nickto

Share this post


Link to post
Posted (edited)
11 hours ago, C2615 said:

I think now a days we could have automatic sextant just like one on space probs.

I think SR-71 had one:

https://timeandnavigation.si.edu/multimedia-asset/nortronics-nas-14v2-astroinertial-navigation-system

 

Edited by Murmur
  • Like 1

"The problem with quotes on the Internet is that it is hard to verify their authenticity." [Abraham Lincoln]

Share this post


Link to post

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  
  • Tom Allensworth,
    Founder of AVSIM Online


  • Flight Simulation's Premier Resource!

    AVSIM is a free service to the flight simulation community. AVSIM is staffed completely by volunteers and all funds donated to AVSIM go directly back to supporting the community. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. Thank you for your support!

    Click here for more information and to see all donations year to date.
  • Donation Goals

    AVSIM's 2020 Fundraising Goal

    Donate to our annual general fundraising goal. This donation keeps our doors open and providing you service 24 x 7 x 365. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. We reset this goal every new year for the following year's goal.


    28%
    $7,170.00 of $25,000.00 Donate Now
×
×
  • Create New...