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- Q191 - Navigation General: Oceans
256. You wish to measure the distance on a Mercator chart between a point in latitude 42°30'N and a point in latitude 40°30'N. To measure 30 miles at a time where should you set the points of the dividers to obtain the most accuracy?
To minimize scale distortion on a Mercator chart, measure distances using the latitude scale at the mid-latitude of the track, which in this case is 4130'N, requiring divider settings of 4115'N and 4145'N.
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