2 (Refer to FAA-CT-8080-2G, Figure 21.) What airport is located approximately 47 (degrees) 40 (minutes) N latitude and 101 (degrees) 26 (minutes) W longitude?
C. Garrison Airport.
The longitude and latitude lines on the Sectional Chart have a tick every minute of longitude or latitude, and a larger tick every 5 minutes. The tick marks are easy to see in this unobstructed view from the side and bottom of the SFO chart.
In the chart segment from the question, below, you follow the vertical longitude line (101°) down from the horizontal latitude line (48°). There are 60 minutes per degree of latitude. so to find 47°, 40 minutes you start at the 48° line of latitude and go down 20 minutes. Each tick mark represents one minute of latitude and every 5 minutes tick mark is larger. So, on the 101° longitudinal line 47°,40' is a large tick mark just above the Lake Nettie National Wildlife Refuge. The lines of longitude increase going west, so from the 101° longitudinal line, count the ticks until you are at the center of Garrison Municipal Airport, and you are at 47°, -39'N, 101°, 26'W
This is correct.
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