Early navigational techniques such as “dead reckoning” were imprecise; consequently, exploring uncharted seas was challenging and inconsistent
The phrase "dead reckoning" refers to an early navigational technique that involved estimating a ship's position based on previously known positions, speed, and direction traveled.
This method was imprecise and prone to errors, making navigation through uncharted or unfamiliar waters difficult and inconsistent. The sentence structure suggests a cause-and-effect relationship between the imprecise nature of "dead reckoning" and the challenges faced while exploring unknown seas.