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Posted

Im new and trying to learn takan in the f18. Im trying to set it so I can fly to an appropriate approach vector. Is there somewhere where the runway angle is written down ?

Posted (edited)

In the F10 map, you can use the ruler to measure the 'True' bearing of the runway.

 

Then you'll want to subtract the Magnetic Variation

 

+6° = Caucasus

+2° = Persian Gulf

+12° = Nevada

 

To get the magnetic bearing for the approach vector.

 

Example - Batumi RWY 13, TACAN 16X

 

F10 map ruler = 126°T

Magnetic bearing = 126 - 6 = 120°M

 

So the course/approach vector to set on the F/A-18C's HSI is 120°M

Edited by Ramsay

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Posted

You should have approach charts in your knee board (rightshift+k) on those the true bearing, runway length, ils/tacan frequency If available should be visible

 

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Posted

On the F10 map if you click the blue circle at the airport you get a chart w/ info including runway numbers. #25 will be between 245 deg and 255 deg. W/ my newbie skill level that works for me. I am going to note mag variation posted by Ramsay to get me closer.

Posted

When executing an instrument approach, you put in whatever the approach plate says is the Approach Course. This may or may not not line up with actual runway heading. The TACAN Rwy 12 approach into Eglin AFB (KVPS), for example, has a final approach course of 113. ATC is expecting you to fly that and not what you calculated as the magnetic heading of the runway. Will anyone care if you put that in instead? Depends, but probably not. Aircraft separation and obstacle clearance mins exist. But is it the correct way to fly IFR? No. You don't need final approach course to line up perfectly with runway heading. At some point, you're going to break out of the weather (or hit your DH/MDA) and proceed visually. That's when you'll make final lineup corrections.

 

Source - I have a non-trivial amount of time flying military aircraft, much of which has been IFR and some of that was in no-kidding IMC.

Posted (edited)
You should have approach charts in your knee board (rightshift+k) on those the true bearing, runway length, ils/tacan frequency If available should be visible

 

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Approach plates, TACANS, and VOR's show direction as magnetic. Also runways have these two big numbers at each end denoting a magnetic alignment. And yes, they do get changed periodically.

 

In some instances where there is a large magnetic variation, directions are given as TRUE and are denoted with a "T" after the direction, e.g. RNAV 13T.

 

Some navigational aids, such as VORs or TACANs may be off by as much as 5 or more degrees in the US. Once they get to a 6 degree difference, they are realigned.

Edited by Zeagle

 

 

Posted (edited)
In the F10 map, you can use the ruler to measure the 'True' bearing of the runway.

 

Then you'll want to subtract the Magnetic Variation

 

+6° = Caucasus

+2° = Persian Gulf

+12° = Nevada

 

To get the magnetic bearing for the approach vector.

 

Example - Batumi RWY 13, TACAN 16X

 

F10 map ruler = 126°T

Magnetic bearing = 126 - 6 = 120°M

 

So the course/approach vector to set on the F/A-18C's HSI is 120°M

 

And if you are landing on carrier`s runway, it has 9° degrees deviation, so (Caucaus Map) Magnetic bearing = 126° - 6° = 120° - 9° = 111° degrees for the final approach.

Edited by DeathAngel1

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Posted
On the F10 map if you click the blue circle at the airport you get a chart w/ info including runway numbers. #25 will be between 245 deg and 255 deg. W/ my newbie skill level that works for me. I am going to note mag variation posted by Ramsay to get me closer.

 

No, actually the runway heading isn’t mathematically rounded but the last number is dropped so 25 will be 250 to 259.

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