This is an adaptation of the original, made a little more powerful, and 
with rules for more situations.

Clairvoyance *2
  This is the ability to focus your mind on a distant point, seeing
things as if you were there. Its range is affected by Power, but not
by any intervening objects. An extended Mind Shield (p. P38) will
interfere, unless the telepath designates the clairvoyant as
"friendly" (he must have Mind Shield skill 12+ to do so). The Mind
Shield only interferes if the focus is within its area; the
clairvoyant can focus just outside the Shield with no penalty and look
into the shielded area (for as far as his Power allows). Note that an
ESPer cannot use a "brute force" attack to reduce the power of a Mind
Shield.
  To use Clairvoyance, take the Concentrate maneuver. At the
beginning of your next turn, roll vs. skill. Success means you see
something; failure means you see nothing (nothing useful, at least).
Once you succeed, you can maintain your focus for as long as you want;
a maintenance roll is required each minute. Shifting the focus to a
new location requires another turn of concentration and a skill roll.
Rotating the point of view or moving the focus forward (e.g., to
follow a moving person) requires a skill roll, but no concentration.
The focus has a maximum Move of Power.
  The range of Clairvoyance is equal to your Power squared, expressed
in feet. Thus, at Power 1 you could see into a package in your hand,
while Power 20 will let you focus on a point up to 400 feet away. The
view is directional; a clairvoyant has a 180-degree arc of vision
(even if he has the Peripheral Vision advantage). The psi can see
anything within Power feet of the point of focus. Everything outside
that range would appear hazy and indistinct; rudimentary observations
may be made, such as, "A number of people are moving around," but the
psi could not tell how many people or what they were doing. Beyond
Power x 2 feet, no observation at all is possible. Your skill
determines how good your remote sight is. Any time the GM would
require you to make a Vision roll, he should have you make a Clair
voyance skill roll, with the same modifiers the Vision roll would
have. Your Acute Vision, Alertness, Bad Sight, etc., do not modify
this roll.
  The ESPer must decide where his mind is focused; is he paying
attention to his focus and keeping the immediate world in the
background, or is he paying attention to his surroundings and keeping
the remote site in the back of his mind? All rolls to see anything
important in the "other" place are at -4. This would apply to Vision
rolls for the immediate world or to Clairvoyance skill rolls for the
remote site. When focused on the remote site, there is no penalty for
noticing noise, smells, etc., from the real world unless the ESPer is
using another form of Clairsentience, in which case the -4 penalty
applies to noticing that type of stimulus also.
  Darkness is no barrier to ESP. A clairvoyant can use his ability
instead of natural vision when moving through an unlit room or to
compensate for blindness by way of a short-ranged form of "sight." The
Blind disadvantage is only worth -30 points to a clairvoyant with
Power or skill greater than 10. If Power and skill are both greater
than 10, he only gets -15 points for it!
  Clairvoyance has a relatively short range. To duplicate the longer-
ranged "remote viewing" feats described in some stories, a psi should
use Astral Projection to travel there in astral form, then use
Clairvoyance to see inside envelopes, or in darkness.
  Special Skill Limitation: Your Clairvoyance does not work in
darkness. You can see into a lighted room, but you cannot read what is
written in a sealed envelope. -50%