Okay I've got a questions and theories to throw out.
First of all I'd like to respond to this.
Mr Bean wrote:As for element zero itself the basis of all ME ships, it alters gravity... something Honoverse sensors are very good at seeing.
Um.. not really... at least not from what I've read and heard. Case in point, the battle fought during Honor's escape from hell. It was never stated that she ordered the on board grav plates turned off, only the grav wedges. this allowed her to sneak into such a close range that she was able to quite literally able to gut the enemy ships from within their own energy envelopes. In fact she came so close that she risked being picked up on non-FTL active sensors. This tells me that FTL gravitics sensors are designed with the intent to detect hyper translations and gravity wedges, both of which are massive, easily detected gravitational anomalies. It's stated in the honorverse books that a wedge is a wide band of extremely focused gravity that can literally tear objects that pass through it into their constituent atoms. Case in point the tug boat that blocks chunks of the station hit during the Oyster Bay attack. To my knowledge the only natural anomalies that can produce these kind of effects are black holes or possibly pulsars.
Now what does this have to do with mass effect fields? Well it's stated in the mass effect series that, and I quote from the wiki:
Mass effect fields are created through the use of element zero. Element zero can increase or decrease the mass content of space-time when subjected to an electrical current via dark energy. With a positive current, mass is increased. With a negative current, mass is decreased. The stronger the current, the greater the magnitude of the dark energy mass effect.
In space, low-mass fields allow FTL travel and inexpensive surface-to-orbit transit. High-mass fields create artificial gravity and push space debris away from starships. In manufacturing, low-mass fields permit the creation of evenly-blended alloys, while high mass compaction creates dense, sturdy construction materials
Now the science I learned tells me that an object with low mass produces less gravity, the higher the mass the more of a gravitational effect the object will have.
Now to get to the point, if gravitic sensors can't normally detect on board grav plates then they
most likely won't detect the same sort of tech when used on board a mass effect vessel. Combine this with the fact that the mass inside the M.E. field is having it's mass artificially lowered relative to the space outside the field, means that any out side sensor would have even less to lock onto than normal. I suspect that mass effect ships would either be completely invisible to grav sensors or at most appear as very weak ghosts.
Please feel free to poke holes in my argument. I also have other questions to raise depending on the answers I receive.