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Uru: To D'ni Hints
Step 3: Calibrating the Great Zero
1 of 5: After you submit a total of 20 Great Zero Markers (GZMs), you'll be given access to the final chamber of Rezeero, which you can walk to through now unlocked doors in the courtyard.
2 of 5: In this chamber are four viewers that instruct you as to where the GZMs that are needed to complete the calibration of the Great Zero are located. At first, only three of the viewers are active (as denoted by the glowing blue buttons).
3 of 5: The Great Zero is calibrated by collecting GZMs located at certain coordinates in the cavern. Great Zero coordinates, which your KI is capable of displaying, are represented in Toran (angle), Distance, and Elevation compared to the Great Zero line itself. Your KI will only display these coordinates after you have found the appropriate GZMs. For example, your distance coordinate will only be displayed after you've found and submitted the Distance GZM.
4 of 5: Each viewer in the final Great Zero chamber gives the coordinates of the GZM you have to find in order to calibrate that certain aspect of the Great Zero's coordination system. There are viewers and GZMs for Distance (represented by an arrow), Toran (represented by a circle), Elevation (represented by a cross), and final calibration/activation. Press the blue button on each of these viewers before collecting the marker itself, otherwise your KI won't be able to find the marker and, as a result, you won't be able to collect it. After you find each GZM, you have to return to Rezeero to submit the GZM (your KI can carry only one at a time) before you can find the next.