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Edit Overlay
Toggle overlay on/off
User Object Menu
                                                           
   When you select "Toggle overlay on/off",  Guide will list the
existing overlays.  You can select one,  and Guide will provide a small
dialog box offering controls turning that overlay on or off,  setting
its color, and specifying the fields of view at which that overlay is
shown.  For example,  constellation lines are (by default) shown in
green,  and at fields from 9 to 91 degrees across. (When you're looking
at a larger field,  such as a full hemisphere, the constellation lines
get crowded and in the way.  Below 9 degrees, they cease to tell you
much of anything.)

   If the overlay in question is already appearing on-screen,  then it
is usually easier just to right-click on it,  then click "Display".
Try this with a constellation line,  and you'll see that it is a much
more intuitive method.  The only problem with it is that the overlay
you want to change will sometimes not appear on screen (perhaps because
it is turned off,  for example.)

   "Edit Overlay" will provide a list of overlays,  plus a "(Create
new overlay)" option.  If you select this 'create' option, Guide
will ask you to supply the new overlay with a name.  (Certain overlays,
including constellation lines and boundaries,  can't be edited.  They
are therefore omitted from the list.)

   When you tell Guide that you want to edit an overlay,  a small
floating dialog box appears.  Its main feature is a set of four radio
buttons:  "Normal Mode",  "Add Lines",  "Add Text",  and "Add Circles".
Each causes the mouse to assume a different function.

   In the "Normal Mode",  the mouse behaves normally:  right-clicking
selects objects in the chart,  and left-clicking pans.

   In "Add Lines" mode,  the mouse behaves normally,  except that
clicking and dragging the mouse with the right button causes Guide to
add that line to the overlay.  You can then add another line segment
with another right-click,  and so on,  to build up a polygon.

   When in  "Add Lines" mode,  you can still click on objects to get
information about them.  But instead of just right-clicking on them,
you have to hold the Shift key and right-click on them.  (This can be
useful if you decide you want to delete a line or two from the overlay:
you can Shift-right click on that segment,  then on "Delete",  and then
pick up from where you left off.)

   In "Add Circles" mode,  the mouse behaves normally,  except that
clicking and dragging the mouse with the right button causes Guide to
add a circle to the overlay.  The size of the circle depends on how
far you drag the mouse.

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