NGA Plotting Chart 931 is for use between lattitudes of 56° to 60° (North or South).
The chart is 35 inches by 46 inches, and the center lattitude is 58°, where a scale of 1:582,040 makes every 4 inches on the chart equal to one second of longitude.
NGA Plotting Chart 931 is for use between lattitudes of 56° to 60° (North or South).
The chart is 35 inches by 46 inches, and the center lattitude is 58°, where a scale of 1:582,040 makes every 4 inches on the chart equal to one second of longitude.