Help: Full range SCAN

Syntax:  SCan [Up|Down|Right|Left|Corner] [<range>|<vr><hr>] [W]

Display a selected portion of the nearby universe.  If no  range
is  specified,  SCAN  defaults  to  a  square  scan range of ten
sectors from the present ship location.  The keywords UP,  DOWN,
RIGHT,  LEFT, and CORNER modify this to include only the part of
this original square specified  (relative  to  the  ship).   The
maximum  scan  range  is 10 sectors, and larger specified ranges
are  reduced  to  this  value.   If  individual   vertical   and
horizontal  ranges  are  specified,  the  scanning field will be
shaped accordingly.  The WARNING keyword if added to the end  of
a  SCAN  command string will flag the empty sectors within range
of an enemy base or planet with !'s instead of  .'s.   The  SCAN
symbols and their meanings are:

L, N, S, V, Y   Federation warships
C, D, H, J, W   Empire warships
        ??        Romulan warship
        <>        Federation starbase
        )(        Empire starbase
         @        Neutral planet
        @F        Federation planet
        @E        Empire planet
         *        Star
                  Black hole
         .        Empty sector
         !        Empty sector within range of enemy port (only
                  when using WARNING keyword)

Examples:

  SC              Scan universe within a radius 10 sectors.
  SC 10           Equivalent to "SC".
  SC 13           Equivalent to "SC 10" or "SC".
  SC 4            Scan universe within 4 sectors.
  SC 4 4          Equivalent to "SC 4".
  SC 2 8          Scan up to 5 rows and 17 columns, centered on
                  the present ship location.
  SC U 4 7        Show only upper half of normal "SC 4 7" scan.
  SC C -5 -5      Scan the region bounded by the present ship
                  location and the location (-5,-5) sectors away
                  (puts ship in upper right corner of the scan).
  SC W            Same as "SC", plus shows danger zones around
                  enemy bases and planets.
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