> A minute per day would be far too much drift for navigation, wouldn't it? Even that was much better than the dead-reckoning they had to do in bluewater befor

> A minute per day would be far too much drift for navigation, wouldn't it? Even that was much better than the dead-reckoning they had to do in bluewater before working chronometers were invented. Your ship's "position" would be a triangle that might have sides ten miles long at lower latitudes.