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   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
information about them. This is especially useful with the Moon,  which has
thousands of named craters.

   You can also add a lat/lon grid,  of specified spacing and color.

   In the case of Mars,  you can select among three bitmaps.  Two are
based on visual observations;  one is based on Viking data.  Few
objects have three bitmaps.  Venus has two:  one shows it as a
cloud-covered planet,  the other as it appeared to the radar-mapping
Magellan probe.  If your viewing location is not on the earth,  you can
look back at the earth and see it with any of three different bitmaps.
Most planets have one bitmap,  or none.

   The Moon has an extremely detailed bitmap.  Unfortunately,  it is
about 90 MBytes and had to be put on the second CD-ROM.  For details
on how to access data from the second CD-ROM,  see page 60.

   Alternatively,  you can switch from the bitmapped views to a "solid
color" mode,  where it is drawn as a shaded,  single-colored sphere.
This option is considerably faster than the bitmapped options,  and for
many smaller satellites that lack a bitmap,  it's the _only_ option.

   Using the slider bars,  you can modify the brightness and contrast
used for the planet bitmap.
                                           
   Set "Earthshine" to 0%,  and parts of the Moon and other objects that
are not in sunlight will appear black.  Set it to 100%,  and they'll
appear as if fully illuminated,  and none will show phases.  You usually
want something bright enough that you can make out features on the dark
side,  but dark enough that you can tell which side is illuminated at a
given time.  For some special project,  you may decide you want a very
dark setting for realism,  or a 100% setting for use in an "atlas" mode.

7d:  The Camera Frame menu                       

   When you toggle the "CCD Frame" in the Display menu, Guide puts a
rectangle on the screen.  You can set the size, position,  and tilt

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