Deck_2014 : General Navigation - 1074/2111
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| The marine sextant is subject to seven different types of errors, four of which may be corrected by the navigator. An error NOT correctable by the navigator is __________ . |
| A) index error |
| B) prismatic error |
| C) perpendicularity of the horizon glass |
| D) perpendicularity of the index mirror |
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