What if Rear-view mirror is PIP, and uses a module? Doing so replaces the battle-grid view from below, and has to be manually accessed, like manually using Advanced Zoom. Like how the battle-grid is not accessible when in 3PV. Compare that to Adv. Seismic Sensor 250m, you can "see" in a 250m bubble around you regardless of cover, the RV mirror PIP could show 120-degrees behind the mech, of up to infinity distance, of course still limited by cover.
Edited by The6thMessenger, 27 October 2016 - 05:51 PM.