[POSSIBLE BUG] - Nav mode HDD graphical error.

[DarkFire]

So, I took off from an airfield with the navigation mode set to "return." I then changed my destination airfield, whilst still in "return" mode. This created a line on the HDD from my original airfield to the approach point for the new airfield, as shown here:

 

 

If I press the "1" key again the navigation mode does not change, but the line from my original airfield to the approach point for the new airfield disappears, as shown here:

 

 

I don't know if this is a bug or not, but it doesn't seem to be documented anywhere in the Su-27 flight manual...