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Notes:
A cheap simple gravity sensor anyone and their dog could make use of without having to write a new one from scratch. Less capable than the inverse gravitic centrifuge but the cost savings might be more important in many cases and the inverse might be overkill for a lot of people, especially in civilian sectors.
Updated. And no: The lower limit is how much interference there is: How much moving mass there is between it and the target. It has a better time seeing through the nosecone of a missile or through the shield of a power-armour out at enemies than it does say, at the eye of a tornado or the heart of a nebulae which would confuse the crap out of it. To this end, extensive chaff, fragmenting an asteroid into lots of moving pieces or swirly storms would be a good way to hide from it since its overwhelmed quite easily.