True Heading option for the F-15E?

[Hez]

Hi All,

I'm trying to hunt down an option within the F-15E to change my MFDs and HUD to display True headings, instead of Magnetic.

Can't find a way in the manual, also can't find it in any submenu in the current build.

Have I missed it, or is this yet to be included? Or did the F-15E not even have a way to change to True headings?

[RodBorza]

I believe Ground Track solves that. It is show as Gtrack on the HSI.

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[777coletrain]

9 hours ago, Hez said:

Hi All,

I'm trying to hunt down an option within the F-15E to change my MFDs and HUD to display True headings, instead of Magnetic.

Can't find a way in the manual, also can't find it in any submenu in the current build.

Have I missed it, or is this yet to be included? Or did the F-15E not even have a way to change to True headings?

Why would you want to use true instead of magnetic? I'm not saying you shouldn't but magnetic is the standard. 

[jaylw314]

I can imagine engineers would recognize the massive safety issue of having a way to switch between mag and true navigation on primary flight instrument.

[Hez]

On 9/13/2023 at 4:40 AM, 777coletrain said:

Why would you want to use true instead of magnetic? I'm not saying you shouldn't but magnetic is the standard. 

So when flying 2+ in PVP and your wing(s) are in non-western jets. Or if you've an automated/human GCI giving you calls in true as opposed to magnetic, as often is the case.

It's not difficult to do the maths in your head, but it's extra mental workload which is easier to remove by everyone running true.

On 9/13/2023 at 4:20 PM, jaylw314 said:

I can imagine engineers would recognize the massive safety issue of having a way to switch between mag and true navigation on primary flight instrument.

Many jets have this ability

Edited September 26, 2023 by Hez

[Galinette]

On 9/13/2023 at 5:40 AM, 777coletrain said:

Why would you want to use true instead of magnetic? I'm not saying you shouldn't but magnetic is the standard. 

Magnetic is a huge mess because the correction varies in time and space. Its only reason to exist is the use of magnetic compass. Inertial navigation and satellite positioning natively use true north which is a stable reference. It's very complex to abandon magnetic, as everyone needs to make the switch at once. Though, it is seriously considered in some places where magnetic is a real pain in the butt.

https://www.icao.int/safety/OPS/OPS-Section/Documents/ICAOSL087Doc1_presentation.pdf

Edited September 22, 2023 by Kercheiz

[jaylw314]

5 hours ago, Hez said:

Many jets have this ability

On secondary instruments, yes.  Less so (or not at all) on primary flight instruments

Edited September 22, 2023 by jaylw314

[Alpha]

Actually all Airliners I know have a Heading Reference Switch to toggle True/Mag - which also affects the HSI, displayed Heading etc.While you normally use Mag there´s cases (high Latitudes, NAT etc) where True is used.

[jaylw314]

1 hour ago, Alpha said:

Actually all Airliners I know have a Heading Reference Switch to toggle True/Mag - which also affects the HSI, displayed Heading etc.While you normally use Mag there´s cases (high Latitudes, NAT etc) where True is used.

I stand corrected, then, thanks!

[some1]

I don't think there's an easy way to change that in the F-15E, maybe if you set the magvar to zero in the INS? If that's even possible.

Most of western aviation works on magnetic bearings, ATC reliance on true north everywhere is one of DCS quirks.

On 9/22/2023 at 2:17 PM, Kercheiz said:

Magnetic is a huge mess because the correction varies in time and space. Its only reason to exist is the use of magnetic compass. Inertial navigation and satellite positioning natively use true north which is a stable reference.

The only system capable of sensing true north in an aircraft is the INS, and most smaller aircraft don't have one, even smaller airliners. Satellite systems can't tell aircraft heading, they can only derive aircraft ground track from position changes, but that's not the aircraft heading if there's any wind involved. Heading data is fed into the GPS system, not the other way round. So the magnetic compass is not going away any time soon, although the information presented to the pilot may change in the future.

 

[Galinette]

3 hours ago, some1 said:

I don't think there's an easy way to change that in the F-15E, maybe if you set the magvar to zero in the INS? If that's even possible.

Most of western aviation works on magnetic bearings, ATC reliance on true north everywhere is one of DCS quirks.

The only system capable of sensing true north in an aircraft is the INS, and most smaller aircraft don't have one, even smaller airliners. Satellite systems can't tell aircraft heading, they can only derive aircraft ground track from position changes, but that's not the aircraft heading if there's any wind involved. Heading data is fed into the GPS system, not the other way round. So the magnetic compass is not going away any time soon, although the information presented to the pilot may change in the future.

 

The gyro compass would like to have a chat with you.

Edit : I was certain that the gyro compasses you find everywhere were purely inertial, I forgot these are slaved to magnetic sensor. My bad

You are fully right that most (and even 100%) of western aviation works on magnetic headings, and that DCS ATC is wrong.

Edited October 2, 2023 by Kercheiz

[some1]

Yep, gyrocompass is what you find on a ship, aircraft have gyromagnetic compass.