How to Read a Sectional Chart for the Part 107 Exam (2026 Guide)

Last updated: September 29, 2026 · Reading time: about 12 minutes

If a sectional chart looks like a patchwork of blue lines, magenta circles, and tiny numbers, you’re not alone. Here’s the useful way in: find the location, identify the airspace at the altitude you’ll actually fly, then check what else affects the mission. Don’t try to memorize the entire chart at once.

This guide starts with the symbols most useful on the FAA Part 107 knowledge test and ends with the checks you’d make before a real flight. It uses current FAA chart guidance and 14 CFR § 107.41 for the rules, rather than treating a colorful map as permission to take off.

Key Takeaways — the 30-second version

• Location first, then altitude: a boundary matters only when your planned flight is inside it horizontally and vertically.
• Line style matters: solid blue often marks Class B, solid magenta Class C, dashed blue Class D, and dashed magenta a Class E surface area. Check the current FAA legend and labels.
• MSL isn’t AGL: charted airspace shelf figures are usually in hundreds of feet above mean sea level; a drone’s height above its launch point is a different measurement.
• A chart isn’t authorization: Class B, C, D, and airport-designated surface Class E operations require prior ATC authorization under Part 107; a UAS Facility Map grid alone doesn’t grant it.

What does a sectional chart actually show a drone pilot?

A sectional chart is an FAA visual-flight-reference map showing airports, airspace, terrain, obstacles, and other aviation information. For a Part 107 pilot, it answers two early questions: “Where is the proposed flight?” and “What airspace or hazards are nearby?” It does not answer every legal or safety question about the day’s operation.

The FAA’s sectional product description puts the scale at 1:500,000 and says the charts are updated every 56 days. That’s a reason to use the current edition, not a reason to skip checks between editions. A temporary restriction or notice can change the picture before a new chart appears.

For the exam, read the figure specified in the question and consult the legend in the supplied testing material when available. For an actual job, begin with a current FAA chart or reputable current chart display, then verify live restrictions and any authorization. The FAA’s chart-guide illustrations are educational examples, not navigation products.

How do you find the location named in a Part 107 chart question?

Start with the exact point the question names: a latitude/longitude, a town, an airport, an obstacle, or a numbered area on a test figure. Find a large reference feature first, then narrow your search. Only after you’ve located the point should you trace boundaries, read nearby labels, and judge the altitude.

On a paper sectional, latitude runs east–west as horizontal parallels; longitude runs north–south as meridians. The FAA divides the chart into 30-minute-by-30-minute quadrangles for features such as Maximum Elevation Figures (MEFs). On a test supplement, “area 3” is a locator, not necessarily the spot where the answer is printed. A nearby airport identifier, railroad, river, or road can be the faster way in.

A simple repeatable sequence is point → nearby airport → boundary → altitude label → legend. If the question gives a distance and direction, use the figure’s scale and verify that you found the correct object. Read the question again before answering: “near the airport” is not the same as “inside surface-based controlled airspace.”

What do blue and magenta sectional-chart lines mean?

Blue and magenta lines are quick clues to airspace type, but color alone is never the complete answer. A solid boundary, dashed boundary, and soft-edged vignette mean different things. Find your proposed point, trace the line that actually encloses it, read the nearby airspace label, and check the current FAA Chart Users’ Guide.

The FAA guide says Class E commonly begins at 1,200 feet AGL unless designated otherwise; a magenta vignette marks many 700-foot floors, while a dashed magenta line identifies an E surface area. Those aren’t interchangeable. Neither an airport icon nor a colored ring, by itself, settles the permission question.

How do you read a Class B or Class C shelf label?

Read a shelf as a vertical slice, not just a circle on a map. Its paired figures give a ceiling and a floor, normally in hundreds of feet MSL. A fictional 40/20 label means a ceiling of 4,000 feet MSL and a floor of 2,000 feet MSL in that particular sector.

Now ask two separate questions. Are you horizontally inside that sector? If yes, will any part of your proposed flight reach its 2,000-foot-MSL floor? If not, you’re below that shelf, but you still have to identify the airspace underneath it. An inner surface core or a different nearby boundary may change the answer.

The FAA guide notes that a plus sign before a Class B floor can mean “upward from above” the listed altitude; Class D ceiling notation has its own conventions. Look up unfamiliar symbols rather than guessing from a memorized color code. For an actual flight, the current chart and authorization tool matter more than an example drawn in a blog post.

What’s the difference between MSL and AGL on a sectional chart?

MSL means height above mean sea level; AGL means height above the ground at the location being measured. An airspace shelf label may be in MSL while your planned drone height is stated in AGL. To compare them, add the flight’s AGL height to the local ground elevation expressed in MSL.

Here’s a deliberately fictional example. Ground elevation at the launch area is 1,650 feet MSL. A proposed 300-foot-AGL flight reaches about 1,950 feet MSL (1,650 + 300), below the floor of a 40/20 shelf at 2,000 feet MSL. At 400 feet AGL, the aircraft would reach about 2,050 feet MSL, within the vertical range of that shelf if it is also inside its lateral boundary. The example does not establish what airspace exists below the shelf.

Use the elevation at the actual operating location, not an airport elevation miles away, for a real site. Terrain may rise along the route, and AGL changes with the ground beneath the aircraft. If a test problem gives an airport field elevation as its reference, use it as the problem specifies; don’t turn that shortcut into a universal preflight method.

When does Class E start at the surface, 700 feet, or 1,200 feet?

Class E doesn’t always begin at the ground. A dashed magenta boundary identifies an E surface area; a magenta vignette usually identifies a 700-foot-AGL floor. Elsewhere Class E often begins at 1,200 feet AGL, subject to the actual chart’s markings and notes. Read the relevant boundary instead of treating every patch of Class E alike.

Why this matters to drone pilots: § 107.41 requires prior ATC authorization in Class B, C, or D, and within the lateral boundaries of a surface area of Class E designated for an airport. It does not say that every flight below a 700-foot Class E floor needs Class E authorization. If you’re below that floor, still identify the underlying airspace and check other restrictions.

An easy exam trap is seeing magenta near an airport and answering “authorization required” without asking which kind of magenta. Dashed surface area or fuzzy 700-foot floor? That one distinction changes the reasoning. Current airport status, chart notes, and actual flight altitude remain essential.

What do airport symbols, obstacles, and MEFs tell you?

Airport and obstacle markings tell you where aviation activity and vertical hazards may be concentrated; they don’t confer permission to fly. On many sectional charts, blue airport symbols indicate a towered airport and magenta often indicates a non-towered one, but confirm the particular symbol and data block against the FAA legend.

An airport data block can include field elevation, runway details, and communication or weather frequencies. CTAF means Common Traffic Advisory Frequency, a useful awareness clue, not a replacement for FAA airspace authorization. If a test question asks for the frequency, read the data block for the correct airport rather than guessing from a nearby label.

Obstacle labels commonly show the top elevation MSL, with height AGL in parentheses. A hypothetical 1,238 (420) denotes a top elevation of 1,238 feet MSL and a 420-foot height above local ground, subject to the chart’s legend and context. An MEF represents the highest terrain or obstruction elevation in a 30-minute chart quadrangle, rounded upward as the FAA specifies. It’s a hazard cue, not the Part 107 maximum legal flight altitude or a promise of obstacle clearance.

Can you solve a complete Part 107-style chart question?

Yes: treat a chart question as a sequence, not a flash-card quiz. Locate the point, identify the boundary enclosing it, read that sector’s floor and ceiling, convert the proposed altitude to the same reference, then decide which rule applies. The following fictional example teaches the method; it is not an FAA test figure.

Scenario. A commercial drone job is inside the lateral boundary of a Class C outer shelf labeled 40/20. Ground at the job site is 1,650 feet MSL. The pilot plans to fly at 300 feet AGL. Does the 40/20 Class C shelf itself require Class C authorization at that planned height?

1. 40/20 means 4,000-foot ceiling / 2,000-foot floor MSL for the fictional sector.
2. Convert the planned height: 1,650 + 300 = 1,950 feet MSL.
3. Since 1,950 < 2,000, the proposed flight remains below this particular Class C shelf.
4. Answer: Not because of that shelf at that height. Now identify the actual underlying airspace and any other restrictions; you cannot declare the whole flight authorized from this calculation alone.

Why the tempting wrong answers fail: “Yes, because it’s inside the magenta ring” ignores the shelf’s floor. “No authorization is ever needed here” ignores the airspace beneath it, nearby core, and any change in planned altitude or location. That’s the reasoning habit the exam is testing—and the habit a paying client needs you to have.

Does a sectional chart or UAS Facility Map authorize a drone flight?

No. A sectional is an information source, and a UAS Facility Map grid shows an altitude at which the FAA may authorize a Part 107 flight without additional safety analysis. Neither is the authorization itself. If your proposed operation enters airspace named in § 107.41, get the necessary prior ATC authorization.

The FAA says pilots can use an approved LAANC service supplier for many controlled-airspace requests, including near-real-time requests where available. Some requests need further coordination or a FAADroneZone authorization pathway. Availability, timing, altitude, and approval aren’t guaranteed. The FAA is explicit: UAS Facility Maps are informational only.

Before takeoff, verify the approval actually covers your location, time, altitude, and operation. Calling a tower, listening to a frequency, or seeing a grid labeled 100 isn’t a substitute. LAANC only addresses airspace authorization; the pilot remains responsible for weather, restrictions, and every other applicable requirement.

What should you check before a real mission?

Use the chart as the start of a preflight, not the finish line. First confirm the current edition and your location; then verify airspace at the planned flight altitudes and any needed authorization. Finally, check time-sensitive restrictions and on-site conditions that a static chart cannot certify for you.

• Current sources: confirm the chart’s effective date, read relevant notes, and check current NOTAMs and temporary flight restrictions.
• Permission envelope: where required, obtain and review the actual authorization, including the precise area, time window, and altitude. A pending request is not an approval.
• Mission conditions: assess weather, visibility, nearby aircraft, terrain and obstacles, launch-site permission, equipment readiness, Remote ID, visual line of sight, and any other applicable Part 107 or local requirements.
• Change control: if your location, height, time, or conditions change, reassess rather than assuming an earlier check still applies.

An exam figure freezes the world so there’s one best answer. A real job does not. That’s why experienced pilots use chart interpretation and live FAA information instead of treating a screenshot as a clearance.

How should you practice reading charts without memorizing everything?

Practice a small decision routine until it feels automatic: locate, trace, label, compare altitudes, verify. Learn the handful of airspace boundaries you’ll encounter often, but use the FAA legend for unfamiliar symbols. Explain each answer out loud; if you can’t say why a tempting option is wrong, revisit the chart.

Start with one concept at a time—surface Class E versus 700-foot Class E, or MSL versus AGL—then tackle mixed scenarios. Drone Launch Academy’s 21 Part 107 practice questions include sectional-chart problems that become much easier once you know the decoding sequence. The Part 107 exam-prep course adds airspace instruction, practice tests, and instructor support if you want a structured route.

That connection to instruction is real, not an invented field story: David Young, the academy’s founder, is an FAA-certified Advanced Ground Instructor and a certificated remote pilot. The takeaway for students is practical: build the habit of explaining a chart, rather than merely recognizing the right-looking color.

FAQ: Part 107 sectional charts

The short answers below address the chart-reading questions beginners most often need resolved. They’re useful for study, but each live operation still calls for a current chart, current FAA restrictions, and any required authorization. If an unfamiliar symbol, label, or local condition changes your conclusion, stop and verify it before flying.

Do I have to memorize the entire sectional-chart legend for the Part 107 test?
No. Learn high-frequency airspace, altitude, airport, and obstacle conventions well enough to use them quickly, then consult the legend and FAA materials for details. Practice with the chart figures and reference material available in the test context rather than depending on rote memorization of every rarely used symbol.

What does a dashed magenta line mean on a sectional chart?
It denotes a Class E surface area. For a Part 107 flight inside the lateral boundaries of a surface area designated for an airport, § 107.41 requires prior ATC authorization. Check the current chart’s label and notes; don’t confuse the dashed line with the fuzzy magenta boundary indicating Class E beginning at 700 feet AGL.

Does Class E beginning at 700 feet AGL require authorization for a 300-foot-AGL flight?
Not solely because of that 700-foot Class E layer: a 300-foot-AGL flight is below its floor. But you must still identify the airspace underneath, check other overlapping boundaries and restrictions, and comply with all applicable operating rules. “Below this layer” is not the same as “cleared to fly.”

What does 40/20 mean in a Class C chart label?
In a typical shelf notation, it means a ceiling of 4,000 feet MSL over a floor of 2,000 feet MSL. Compare your aircraft’s location and altitude with both figures. The label describes that sector, not every point near the airport; read the applicable sector and current FAA legend.

Is a Maximum Elevation Figure a drone’s legal altitude limit?
No. The MEF is an FAA charted indication of the highest terrain or obstacle elevation in its quadrangle, with rounding and source-data allowances. It alerts you to vertical hazards; it isn’t an authorization, a clearance guarantee, or the Part 107 ceiling for your particular flight. Read the obstacle and terrain information separately.

Can a LAANC grid altitude or chart screenshot replace approval?
No. The grid is planning information, and a screenshot may be out of date. Obtain the actual authorization through an approved process when one is required, then match its area, dates, times, and altitude to your intended operation. Also check current NOTAMs, TFRs, weather, and other restrictions; LAANC doesn’t waive them.

Bottom line: A good pilot doesn’t just name the colored ring. Find the point, read the boundary, compare altitude references, and verify permission and current conditions. Keep the FAA Chart Users’ Guide handy while you study—and keep your operational sources current when a real flight is on the line.