Which navigation risk increased when 18th-century mariners relied solely on sextants without chronometers?

💡 Explanation

When lacking a chronometer, calculating longitude using a sextant involved dead reckoning for time estimation, causing accumulated errors in east-west position because time is directly linked to longitude calculations. Therefore, inaccurate longitude calculations resulted, rather than latitude, body ID, or compass issues which relate to other navigational factors.

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