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FSX Adf card

Roy Holmes

Roy Holmes

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I know the SDK says this is the ADF compass rose setting in degrees, but does anyone know what that means?

An ADF bearing will always be relative to where the aircraft is pointing/heading, (like 30° right), being the direction to the ADF beacon compared to heading.

A compass rose will be orientated with respect to the aircraft heading, be it true, magnetic etc.

So what is an ADF Compass Rose? And what does it indicate? Beats me.

Roy
 
Roy Holmes said:
So what is an ADF Compass Rose? And what does it indicate? Beats me
Click to expand...

Roy, we've walked this path before, but since you apparently didn't believe me at the time, I just let the matter drop.

However, since you're asking now, there are 2 types of compass rose dials that can exist in the navigational unit. One is a fixed compass rose, called a “Fixed Card” ADF. Zero degrees is always shown on top of the card. The “Rotateable Card” ADF allows the compass rose card to be rotated.
Click to expand...
Moveable Card ADF
Some aircraft are equipped with an ADF instrument in which the dial face of the instrument can be rotated by a knob. This is called a Moveable Card ADF. By rotating the card such that the Magnetic Heading (MH) of the aircraft is adjusted to be under the pointer at the top of the card, the Bearing to the Station (MB) can be read directly from the compass card. More sophisticated instruments of later design automatically rotate the compass card of the instrument to agree with the magnetic heading of the aircraft. Thus MB to the station can be read at any time without manually rotating the compass card on the ADF face.
Click to expand...

http://www.pilotfriend.com/training/flight_training/nav/adf.htm

That is precisely why in the previous discussion, I provided sample script for my ADF unit. It is a modern one in which the compass rose is gyro driven (just like the HSI).
 
Bill,

Thanks. Now I understand how it works and what it would be used for. Guess I should have researched it in more detail before asking the question.

Mea culpa

Roy
 
No problem, Roy! I've eaten my share of crow over the years from being a bit too hard-headed... :rotfl:

The main point is that we have the A:vars and K:events to build all three types of indicators...
 
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