You can change type of mortar rounds from action menu. You can cycle through range settings with ‘F’ key (fire mode) until you get sensible output from ballistics computer. There are 3 range setting you can use: close, medium and far. If you see X in the centre of the screen, this means the ballistic computer cannot calculate suitable elevation based on range. If Actual Elevation Required Elevation, they will fall short of target. Your Actual Elevation should be set to this value. Required Elevation – This is output of your ballistic computer based on range.You change elevation the same way you change zeroing on rifles, PageUp and PageDown. Actual Elevation – This is your mortar elevation that will directly influence the mortar travel arch, which will affect where it lands and its travel time.Vision Mode – There are 2 modes normal VIS and night vision NV, you don’t need to have NV Goggles. D-pad Left Fire Mode: Utilize this function when using a weapon that offers multiple firing modes to change the fire mode i.e.Travel Time – Estimated time for the mortar round to reach the target.Range – The range to the target in metres.You can change it back and forth to max of 90.0x by using + and – keys on Num pad. Because elevation of the actual mortar is also measured from base this value needed for the ballistics computer.

Angle With Base – The difference angle between your rangefinder and the base of the mortar.Direction – Is the same value as your compass heading.Now you are left with 3rd person view, that is completely useless, and first person view, which has all these gauges and numbers and crossed lines… So how do they do it? Lets look at the picture:

Arma 3 how to change fire mode