NGA Plotting Chart 921 is for use between lattitudes of 3° to 11° (North or South).
The chart is 35 inches by 46 inches, and the center lattitude is 7°, where a scale of 1:1,087,566 makes every 4 inches on the chart equal to one second of longitude.
NGA Plotting Chart 921 is for use between lattitudes of 3° to 11° (North or South).
The chart is 35 inches by 46 inches, and the center lattitude is 7°, where a scale of 1:1,087,566 makes every 4 inches on the chart equal to one second of longitude.