JaJa, try this on your own.. go outside and point to the house four blocks away over your shoulder and picture where the front door would be. Now tell your mortor crew to hit that. What ? Thats about what you are trying to suggest...Ok you want a FM in the trees, say 442m away ... or behind the buildings across town, now let me say that unless you have a 'sight'(distance and direction) on the target (yes, LOS is right, without the FDC all you have is the ability of the crew to direct their own fire.) firing at targets out of view would mostly be a waste of time. I read a book years ago about a mortor crewman fighting in the Pacific for the Marines. It is an excellent book, yet at this moment I can't recall the title(maybe someone can help).
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Run in circles, scream and shout...Brown side in, green side out...