OD & OG Flash on HUD....

[Cato]

I notice when I push ENTER on the UFC I get a flashing 'OD' and underneath it a 'OG' in the middle of the HUD. When I press the SELECT rocker on the UFC, the 'OG' is replaced with a '7R'. I've looked through the forums here the DCS and Chuck's guides for any meaning to this. Anyone know what this means and its function? 

[ASAP]

22 hours ago, Cato said:

I notice when I push ENTER on the UFC I get a flashing 'OD' and underneath it a 'OG' in the middle of the HUD. When I press the SELECT rocker on the UFC, the 'OG' is replaced with a '7R'. I've looked through the forums here the DCS and Chuck's guides for any meaning to this. Anyone know what this means and its function? 

Pressing enter on the HUD takes a "delta" which is the difference between your GPS derived altitude and the altitude derived from your altimeter. In the sim it's not really simulated, but when you hit enter the number that your jet is deriving for the delta pops up. It's showing a zero for Delta and GPS because in sim land there is no difference. you hit enter again to accept the values. If you hit enter and you saw XXXXD over XXXXG it would mean your system is messed up and you need to manually enter a delta value through the IFFCC menu. You'd basically ask your wing man what delta they got and copy them, or you'd reference the weather planning data you took off with.

Without getting too far into the weeds, when you do that you are storing those numbers in IFFCC. They don't really matter until you have an issue with your GPS or jamming that degrades your FOM to something worse than D5/B1 which indicates you didn't have a good GPS altitude source, you'd set that little switch "alt source" switch on the AACP (middle row on the left, it normally is in "baro") to "delta" and it'd use those values to calculate your actual altitude vs the altimeter altitude. 

That's all really important for the bombing triangle and your jet being able to accurately calculate weapons delivery stuff...  but again, not really important in a virtual environment that is far simpler than real life.

[Cato]

OK, got it. Thanks ASAP!