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Ouranos, Lumicon,  Advanced AstroMaster,  Orion Sky Wizard,  B-Box,
and a few others.  Despite the variety of labels,  all of these are
actually made by Tangent Instruments, and are also referred to as
"Tangent Instrument boxes."

   JMI/MG-III type systems are also called "dumb boxes",  because all
they return to the PC is the position of the encoders.  The PC is
expected to provide the "brains" needed to convert encoder readouts
to RA/dec data.

   All the other devices,  such as the LX-200 and Ultima 2000,  have
built-in alignment systems.  Once you have aligned them (typically by
pointing them at one or more known reference stars),  Guide is ready
to communicate with them.  But for JMI/MG-III type systems,  the
alignment has to be done using Guide.  The process is described in
the next chapter.
                                        
   As with the LX-200 control pad,  the Scope Pad provides four
buttons to allow motion north,  south,  east,  and west, plus a
central "stop moving" button;  and there are four rates of motion
provided. (Obviously,  none of these work with encoder-based systems.
Such systems don't have motors with which to move the telescope.)

   There are some additional buttons below these that are specific to
computer control of a scope.
                               
   "Slew Scope" is used for aiming the telescope.  If you have found
and clicked on a location in Guide, hitting "Slew Scope" will slew the
telescope to that location. You can also do this by hitting F11 or
Ctrl-F1 at any point in Guide.

   For the JMI/MG-III based systems,  there are again no motors to move
the telescope.  In this case,  a red indicator appears on the chart to
show where the telescope is pointed,  and is updated every second or
so.  Clicking on "Slew Scope" again will shut off the display of this
indicator.
                       
   The "Slew Guide" option will cause Guide to find out where the
telescope is pointed.  Guide will then pan to that location, leaving
the telescope where it is.  You can also do this by hitting F12 or
Ctrl-F2 at any point in Guide.

   Also,  if you have toggled to the Sky Commander and have selected
its port,  you can copy a list of positions from Guide to the Sky
Commander.  You can then take the Sky Commander into the field and
observe those objects.  This is further described in the section on the
User Object menu,  on page 39.

   One note about the "Alt/Az" system.  This button corresponds to a
stepper-motor system designed by Mel Bartels and used by several
Dobsonian owners.  The advantages of the Alt/Az system are simplicity,

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