Which navigational error increased significantly off the Scilly Isles during the 18th century before widespread use of chronometers?

💡 Explanation

Before chronometers, longitude was estimated via dead reckoning, where accumulated errors increased with distance sailed, affecting the ability to pinpoint location thus causing significantly greater risk of calculating it vastly different. Therefore increased errors in longitude estimation resulted, rather than reliance on flawed inputs regarding magnetic, position or speed.

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