UAS Navigation 2 — Questions and Answers
Question 1: When using a sectional chart, what does a magenta dashed line indicate?
- Class B airspace boundary
- Class C airspace boundary
- Class E airspace starting at 700 ft AGL (Correct answer)
- Class D airspace boundary
Correct answer: Class E airspace starting at 700 ft AGL
A magenta dashed line on sectional charts denotes the boundary where Class E airspace begins at 700 feet AGL.
Question 2: What is the primary purpose of a VFR waypoint depicted on a sectional chart?
- To mark restricted airspace boundaries
- To provide a named reference point for visual navigation (Correct answer)
- To indicate a mandatory reporting point for IFR traffic
- To mark the location of a VOR station
Correct answer: To provide a named reference point for visual navigation
VFR waypoints are named reference points that help pilots navigate visually without requiring instrument references.
Question 3: A sUAS pilot is operating near a congested area and needs to determine the MSL elevation of terrain. Which chart feature provides this information?
- Isogonic lines
- Contour lines and spot elevations (Correct answer)
- Airspace boundary lines
- Latitude/longitude grid lines
Correct answer: Contour lines and spot elevations
Contour lines and spot elevations on sectional charts indicate terrain elevation above mean sea level.
Question 4: What does the term 'dead reckoning' refer to in UAS navigation?
- Using GPS as the sole navigation source
- Estimating current position based on a known past position, speed, heading, and elapsed time (Correct answer)
- Following visual landmarks exclusively
- Using ATC radar vectors for navigation
Correct answer: Estimating current position based on a known past position, speed, heading, and elapsed time
Dead reckoning calculates a present position from a known starting point using speed, heading, and time without external reference.
Question 5: On a sectional chart, what symbol indicates an obstruction between 1,000 and 1,999 feet AGL?
- A small open circle
- A high-intensity obstruction light symbol
- A bold obstruction symbol with elevation figures (Correct answer)
- A low-intensity light symbol
Correct answer: A bold obstruction symbol with elevation figures
Obstructions between 1,000–1,999 feet AGL are depicted with a bold obstruction symbol accompanied by MSL and AGL elevation figures.
Question 6: When a remote pilot references a sectional chart, the longitude lines (meridians) run in which direction?
- East to west (horizontal)
- North to south (vertical) (Correct answer)
- Diagonally from northwest to southeast
- In arcs following the curvature of the Earth only
Correct answer: North to south (vertical)
Meridians of longitude run north to south and converge at the geographic poles.
Question 7: What is the significance of the maximum elevation figure (MEF) shown in each quadrangle of a sectional chart?
- It shows the average terrain elevation in that area
- It represents the highest known feature (terrain or obstacle) in that quadrangle, rounded up for safety (Correct answer)
- It indicates the minimum safe cruising altitude for IFR flight
- It marks the transition altitude for pressurized aircraft
Correct answer: It represents the highest known feature (terrain or obstacle) in that quadrangle, rounded up for safety
The MEF is the highest elevation of terrain or obstacles within a quadrangle, rounded up to the nearest 100 feet, to assist in terrain clearance.
UAS Navigation 2
When using a sectional chart, what does a magenta dashed line indicate?