| From: | Gurth gurth@******.nl |
|---|---|
| Subject: | magical effects for sea-going runners.... |
| Date: | Tue, 16 Mar 1999 11:51:49 +0100 |
the street was...
> Ok. First question. What effect would a silence spell cast underwater have
> on sonar? Either passive or active.
On active sonar it would have the result of causing a blind spot -- the
ping going into the area doesn't "bounce" back to the sonar, so as far as
the device is concerned, _nothing_ is there, not even the sea bed (if
that's "behind" the spell, looking from the sonar).
Passive sonar listens to the sounds emitted by the target, which in this
case would be none due to the Silence spell. Thus, passive sonar would not
see anything in the area of the Silence spell. It wouldn't apear as an
area of nothingness, because a passive sonar doesn't get echos from silent
objects anyway.
> Next, using 2nd edition spells and following this train of thought...
> -- Physical Mask spells effect electronic detection devices.
> -- Vehicular Mask disuises a vehicle or drone.
> -- A jellyfish is practically nothing but water and would not be picked up
> by sonar.
> So. Then. What happens if you mask your drone as a jellyfish?
I'd say the sonar wouldn't pick up the drone, thus in effect allowing the
Vehicle Mask spell to work like an Invisibility spell.
--
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