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Which navigational challenge limited accurate charting on 18th-century ships navigating eastward due to accumulated error?

A)Magnetic declination variation
B)Lunar parallax inaccuracies
C)Chronometer drift over time
D)Sextant calibration instability

💡 Explanation

When chronometers lost accuracy, the longitude calculation would drift because the time offset directly influenced this calculation, accumulating daily westward during eastward travel. Therefore chronometer drift matters to charting inaccuracies, rather than magnetic errors, parallax or sextant, each of which have different error signatures.

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