We write in ArmA 3 the year 2035, where everything is modern and futuristic. So why not the mortar? When you get in the mortar you will probably use the artillery computer because its the most accurate way to fire with an artillery equipment. I know the realism friends want to use it as it is, but you can wait for ACE :D And the the most important thing is, that A3 is set in 2035 and then the evolution should be so far that even a mortar has a touchscreen display. Lets just be honest...