On an 18th-century wooden ship which navigation error resulted principally from the sextant using vernier scales in high seas?

💡 Explanation

In high seas, precise sextant observations became difficult because the **vernier scale interpolation**'s precision couldn't be maintained on a constantly shifting platform. This caused *exaggerated instrumental error of graduation*; therefore, the angle readings were less accurate, rather than any lunar or declination issue. Astrolabes are ancient, not relevant.

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