Is it possible to use your sensors (such as ultrasound...) and have them simply overlay on your AR feed. How would you handle the roll? Do you NEED to make a sensor roll, or would it be device rating x 2 since it is passive? Or would it simply flag something is up to alert you to make a sensor check? Seems like a lot of things could be handled this way (if possible rule way). Would this be considered working in AR (and the -2 penalty to everyting else?), or since it is just an overlay (which crunch wise everyone is seeing the AR overlay from ads, clothing, iconography and what not...). In fact seems like a perfect task for an agent...
Tying this into matrix perception. I try to use my matrix perception as a sort of 'radar' when in a search and sneak situation, or potential ambush. Actively looking for signals and such (especially weapon icons). Yes, some enemies will go wireless, but most sill use a commlink or communication device...
How do you handle sensors? Must you actively use them and only them (override your normal senses?), can you overlay and augment (highlight)?