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arcsecond precision  is more than sufficient,  but there are cases where
the additional level of accuracy in "full precision" is truly necessary.
It also allows Guide to claim higher accuracy than other software.  Those
wanting specific details of Guide's accuracy should look here:

http://www.projectpluto.com/accuracy.htm

7c:  Planet display             

   When Guide shows a planet or natural satellite,  and the field of
view is so large that the object would appear as only a few dozen
pixels,  that object is shown as a small cross-mark labelled with a
symbol.  You can change its color from the Data Shown dialog,  and
you can click the "Label planets by name" option in that dialog to
cause Guide to use names in place of symbols.

   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   |
|                               |
|   ( ) Solid color             |
|   (o) Bitmap #1               |
|   ( ) Bitmap #2               |
|   ( ) Bitmap #3               |
|                               |
|  Contrast:   [       *    ]   |
|  Brightness: [  *         ]   |
|  Earthshine:  [ 50 ]          |
|                               |

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