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With the arsenal rules of indirect fire information-guided... omg
Awe that is pretty cool MarCazm! Nice call.
Tarantula I believe psionghost is correct in LoS. The spell is stated as being directional and the SR4 states "directional (like normal site)" (SR4 p197). Which reads line of sight to me. Force x Meters (x 10 if extended) is the distance the spell can move before fading.
Sma and psionghost bring up another point. Can you do a 360 degree turn at the Point of Vision (PoV)? The spell says directional which I am now wondering will only allow you to move its PoV forward in a straight line, so you would not be able to move through a door with it, head down the hall, hang a right, and look inside the corps room to see if they have what you are looking for.
WeaverMount, the only way you would be able to detect the PoV is to view it in Astral Space with Assessing. If you score enough hits you would be able to follow the spell back to the person who cast it. Even if they released the spell before you reached them since every spell you cast leaves a residual matter in Astral Space. How the risdual matter is viewed I believe the SR4 tells you somewhere under Awakening section.
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Direction answers to your questions are:
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How do you detect the PoV?
In Astral Space.
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If you cast the spell on yourself and move the PoV into a room with an astral perceiver is it possible for them to detect the PoV?
Yes, there is a chance for them to perceive the spell. It would be an Assessing test, and based on the number of hits they receive would determine the amount of information the GM would give.
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they can't see the spell in your Aura because you and the spell are on the other side of a wall.
Actually they can see the spell in Astral Space and if the opposer (person who did not cast the spell) makes a successfull Assessing test then they can follow it back to the person who cast it for all spells leave a residue, but even better is if the opposer has assessed you in the past then regardless of the Assessing test outcome they will still know it is you since every spell matter is like DNA and it is all made up from your matter (aka residue).