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   The real capabilities in how Guide shows planets only become apparent
when you zoom in far enough for the object to show a disk.  For many
objects,  a "bitmapped surface" is provided.  Zoom in on,  for example,
the Moon,  or Venus,  or Mars,  and you get a fairly realistic rendition
of its surface.  The correct side is oriented to you;  phase effects are
shown.  Zoom in on Jupiter,  and any shadows cast on it by its moons
will be apparent.

   Right-click on a planet or natural satellite,  and select
"Display", and you'll get the usual controls over color,  labelling,
on/off, and magnitude limits for planets.  But when you click on the
"Options..." button in that dialog,  you get some finer control over
how that particular object is shown:

[ ]-- Mars -------------------[X]
|                               |
|  [X] Full precision           |
|  [ ] Label by name            |
|                               |
|  Mars:                        |
|   [X] Show features   [   ]   |
|      Feature density:  [_50_] |
|   [X] Label features  [   ]   |
|   [ ] Lat/lon grid    [   ]   |
|       __30_ x __30_ degrees   |
|                               |
|   ( ) Shaded                  |
|   ( ) Line figure             |
|   (o) Bitmap #1               |
|   ( ) Bitmap #2               |
|   ( ) Bitmap #3               |
|                               |
|  Contrast:   [       *    ]   |
|  Brightness: [  *         ]   |
|  Earthshine:  [ 50 ]          |
|                               |
|     [ OK ]   [ Cancel ]       |
`-------------------------------'

   The "Full Precision" and "Label by Name" options are identical to
those accessed through the Data Shown dialog,  and are discussed on
page 21.  They affect all planets.  But the remaining options will
affect only the currently selected planet (Mars,  in the above example).
                                               
   For Mars (and some other planets),  a long list of features (craters,
volcanoes,  markings) is available.  Set the "Show Features" option,
and they will be marked;  add "Label features",  and they will be named.
You can select colors both for the features themselves and their labels,
and set the "density" of features (a larger number causes more features
to appear.)  When features are shown,  you can right-click on them to get

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