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: http://www.apo.nmsu.edu/35m_operations/TUI/Guiding/GuidingUsersGuide.html
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By Russet McMillan with some changes by Russell Owen.
Here are some tips on how to get the best guiding out of our current system. The 3.5m guiders are very powerful, but they can't make all the decisions by themselves, so you'll get better results if you know what you're doing.
At the beginning of your observing time, check the mask and boresight:
tcc set imcenter=(240.0, ypos)
tcc set imcenter=(xpos, ypos)
Boresight guiding is convenient because your target doesn't have to be perfectly centered before you press the Guide button; the guider will pull it in as long as it's within a few arc-seconds of the blue cross. You can control-click your target onto the boresight, verify its position and brightness on the new image and turn on guiding.
If your target is too faint and you have a suitable star in the slitviewer field then consider Field Star guiding.
Before you start Field Star guiding, center your object on the boresight as well as you can. We suggest you control-click your object to center it. If the result is not good enough, zoom in and control-click again or use some other technique to apply suitable offsets (for example use the Nudger to apply Guide XY offsets). Note: if you don't trust your object coordinates then you may get better guiding by first asking the observing specialist to calibrate pointing, then applying Object offsets to center your object on the boresight.
Warning: once you are guiding, the only way to tweak up guiding is to apply Boresight offsets (e.g. with the Nudger). Control-click or any other kind of offset will quickly be undone by the auto-guider! If you prefer, you may temporarily turn off guiding, re-center any way you like, then turn guiding back on. Remember that boresight offsets are applied in the opposite direction of other kinds of offsets.
For easiest Manual guiding, open the Nudger window from the TCC menu. You can use either Guide XY offsets (these move the slit, not the star) or Boresight offsets if you are more accustomed to them (these move the star, not the slit). Set the MaxOff to 1 if seeing is fairly good, 2 if seeing is bad or conditions are windy. The box with the crosshairs is a picture of the n arc-seconds around the slit, where n is MaxOff. Click in the box to show the direction and distance you want the slit or star to move, depending on what kind of offset you're using.