5.2  Startup Mode Menu 

In addition to the menu system that is available during normal usage, there is a separate 

menu that is displayed each time Gemini is powered on.  This menu allows you to select 

the startup mode of the system for that particular observing session.  The choices are: 

Cold Start

Warm Start

Warm Restart

5.2.1  Cold Start 

When Gemini is powered on for the first time or after a CMOS reset, a "Cold Start   is the 

only startup option available.  Once Gemini has been cold started, "Cold Start," "Warm 

Start," and "Warm Restart" are displayed as menu items the next time Gemini is powered 

on.  "Cold Start" is the "start from scratch" choice because it deletes all previously 

established star alignments, as well as any pointing model derived from previous 

alignments.  It is the startup mode that must be used after the mount has been moved 

from its previous polar aligned position.   

Starting with Level 3 version 1.01, you are able to change the UTC Date/Time, Mount 

Type, Longitude and Latitude immediately after a Cold Start.  Refer to section 2.3.2.1 

Cold Start Setup Options for an explanation of how this is done. 

Assuming Gemini was polar aligned (sections 2.3.1.1 and 3.4) and powered on with the 

telescope in Startup Position (section 2.3.1.2), you can easily GoTo a first alignment star 

from the "GoTo Bright Star" menu item, or select a star from the "Bright Stars" catalog 

and perform a GoTo operation.  Using either method, the star to be used for alignment is 

then centered in the telescope 

s field of view and "Synchronize" is executed.  This 

constitutes the initial star alignment, and is the first step in the process of building a 

pointing model for improved GoTo accuracy.  Subsequent star alignments can then be 

performed one at a time by commanding Gemini to GoTo other Bright Stars, centering 

them in the field of view, and executing "Additional Align.   The Gemini may be 

powered off at any time without losing its pointing model. 

If the Gemini is subsequently powered on without the telescope having been moved in 

any way, "Warm Restart" is the startup mode of choice and the telescope is immediately 

ready for use.  If the clutches were loosened, you should select "Warm Start."  This mode 

preserves the pointing model but assumes that the telescope is in the Startup Position.  In 

this case, the telescope must first be centered and Synchronized on a known star before it 

is used (as with a Cold Start).   

5.3  Menu Reference 

This section presents an item by item list of the menu commands along with a brief 

description of what the menu item does and how to use it.  While some of the menu items 

can stand alone (such as   Dim Display  ), others (such as   Additional Align  ) require a 

Gemini Users Manual 

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