Sneaky mage, ultrasound and the stealth spell Options

[fistandantilus4....]

Looking over the stealth spell, it reads ""the subject can move in complete silence, and nothing they do makes noise.Things not being touched by the subject can still make noise."

Where as silence specifically states that it works against technological devices, "and it's useful for jamming alarms, detection devices, sonar, and tactical communications."

So according to that, ultrasound is affected by the silence spell.

Would stealth have ANY effect against say, ultrasound goggles? a +2 perhaps, sort of like the side effect from traceless walk to stealth tests? Or no effect what so ever?