[Mobhack]

Are you talking about the pathfinding algorithm here?

If so, if you give a unit a multi-hex move by clicking on a hex a lon way away, it will use the least-cost path. Roads and similar cost least MP so it will gravitate to them to get where you told it to go.

Therefore if terrain masking is important, it is best to go hex-by hex and do it yourself, not to rely on the pathfinging algorithm. I only rely on thta when in the rear or behind a hill from the enemy etc.