NexStar 11 GPS Initial Setup

amateur astronomy
and
astrophotography

 

The first time setup for the Celestron NexStar GPS series should be done in the following steps.

Set the scope outside in an area where it will have full access to the sky - no tall buildings, thick trees, etc. really close to the scope. Loosen the ALT and AZIMUTH locks and position the telescope tube vertically with the eyepiece end pointing straight up - just like it came in the box. Now lock it down. Make SURE the ALT and AZIMUTH locks are engaged ALL the way.

Turn the scope on. It should say "Nexstar GPS". Press "Enter" to select GPS Alignment. At this point the telescope should start moving around looking to point North and level itself horizontally. Once it stops moving it should be pointing pretty close to the North. Verify this from your own personal experience. Mine was off by a quite a bit the first time. After a few seconds, it will move to somewhere near the first alignment star and tell you its name. If you live in a relatively light polluted area like I do, and the telescope is not pointing at a tree or a building, you should see a star much brighter than the rest in the general vicinity where the scope is pointed. Also, if you set up just as it's getting dark, only the brighter stars should be visible - and these are the ones the scope uses.

If you want to verify the star, the back of the manual has reference sky charts with the alignment stars circled. On page 67 is the one for March - April. Notice East and West are reversed in relation to North. This is normal because the charts assume that you're looking up :). Put it over your head and align it roughly to the north and you'll see East in the right direction.

Now use the cursor controls and center the star in the finder. Press "Enter". Now CAREFULLY center the star in the eyepiece and press "Align". You want to be really accurate this first time so take your time and do it right. The scope will do the same thing for the second alignment star. Repeat the process above. If everything goes right it will then say - Alignment Successful.

The first time around my scope was off by quite a bit on all this stuff. That's normal until you calibrate the compass and the level. Next, and this is the important part, press Undo until the readout says Nexstar GPS. Press Menu. Use the Scroll keys (#s 6 and 9 on the keypad) and find Utilities. Press Enter. Scroll again and find Compass. Press Enter. Scroll and find calibrate. Press Enter. Press Undo to go back to the Utilities menu. Scroll and find Alt Sensor. Press Enter. Scroll to Calibrate. Press Enter.

If you were really careful on your star alignment you scope is now very well calibrated for your magnetic deviation and level and should point very accurately from now on. Look at your tripod and find the word Celestron on the spreader between the legs. Remember where it's pointing and set it up the same way the next time. The next time you power up the alignment stars should be in the finder or really close (less than a finder's width away.

 

 

 

 


Monitor Calibration Scale

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