[Imp]

I would say normaly no play with default settings, over time you get a feel for capabilities & adjusting changes them.
Do on occasion adjust for low visibility, night or storm for a change. Sometimes decrease to hit slightly but normally leave.
Adjusting searching down in low vision however has the effect of making infantry harder to find with little impact on locating vehicles which seems right.
Works pretty well for night & vehicle silhouetted but for storms really need to be able to define wind. Seeing into heavy rain is a lot harder than looking in the direction the winds blowing to.
In the dessert attacks were often timed to take advantage of sunrise/set & heat haze as this had a effect to.