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- Q211 - Navigation General: Near Coastal
160. To measure distance on a Mercator chart between the parallels of LAT 34°30'N and LAT 31°30'N, which 30- mile scale should be used?
To minimize distortion when measuring north-south distance on a Mercator chart between latitudes 3430′N and 3130′N, use the 30-mile scale centered on the mid-latitude, which is 3245′N to 3315′N.
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