Deck : General Navigation - 845/2138
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| A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant is rotated about the line of sight the images separate. The sextant has __________. |
| A) prismatic error |
| B) centering error |
| C) side error |
| D) error of perpendicularity |
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