Creating a "User Defined Catalog" can be very useful because it allows you to compile a 
catalog of objects not resident in Gemini's databases, or to limit a catalog to only those 
objects needed for a particular night's observation. For your convenience, the objects 
stored in Gemini' s permanent databases are available as   .guc   (Gemini User Catalog  ) 
files on the above mentioned web site. These files can be used to build your own catalogs 
for planned observing sessions. 
5.3.3  Show Information 
This menu item allows you to scroll through Gemini 
s information buffer.  Pressing the 
RA+ button speeds up the scrolling, and pressing RA  sets it back to the beginning if 
pressed alone.    Pressing first RA , then RA+ stops the scrolling and freezes the 
information buffer display.  If either of the DEC buttons is pressed, all scrolling stops and 
Gemini proceeds to the adjacent menu item. 
 Upon powering up, the information buffer scrolls a welcome message, and later on 
contains additional status information.  It will contain object data after you select an item 
from the database, mount modeling parameters after you do an "Additional Align" or 
"Synchronize," and debug information if Gemini is in Debug Mode (powered on with a 
button of the Hand Controller depressed).  In Debug Mode, the commands received from 
a connected PC (without numeric parameters) are stored in the buffer.  Pressing the 
MENU button while the welcome message is scrolling terminates the scroll. 
5.3.4  GoTo  
This menu item only appears if you previously selected a "Database Object," entered RA 
and Dec coordinates using the Hand Controller or a PC, or an object was selected using 
the   Identify   function.  This menu item remembers the last selected object or 
coordinates, and allows you to GoTo that object.  Consequently, if you want to GoTo a 
different object, the new object must first be selected from the "Object Database" (or one 
of the other methods mentioned above).  Slews to objects below the horizon will be 
rejected. Pressing any Hand Controller button during the slew will interrupt the GoTo 
function. 
5.3.5  Guide AE  
This menu item only appears if you have selected a "Database Object," entered RA and 
Dec coordinates using the Hand Controller or a PC, or an object was selected using the 
  Identify   function.  This menu item shows the difference between the actual telescope 
position and the unmodeled location of the selected object.  You can move the telescope 
manually (if you have encoders) and/or using the Hand Controller until the display shows 
all zeros.  Selecting this menu item switches you back to Telescope Control Mode.  The 
display saver is off so the display will not go blank while you are using this feature.  
"Guide 
AE
 " shows the distance to the un modeled position of an object, 
informing you of what deviations were calculated by the model after a GoTo.  It can be 
used to offset the polar axis when using the King method for photography.  Refer to 
chapter 4 for more details. 
Gemini Users Manual 
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