An FAA sectional aeronautical chart is the standard navigational map used by visual flight rules (VFR) pilots in the United States. Published by the FAA's Aeronautical Information Services and revised every 56 days, sectional charts display terrain, airports, airspace boundaries, radio navigation aids, and thousands of other features pilots need to plan and execute safe VFR flights.
Understanding how to read sectional charts is a core competency tested on the FAA Private Pilot Knowledge Test (PAR), the Instrument Rating Knowledge Test (IRA), and the Commercial Pilot Knowledge Test (CAX). This guide covers everything from chart symbols and legend to airspace classification and latitude/longitude identification.
A sectional aeronautical chart is a 1:500,000 scale topographic map specifically designed for VFR aviation navigation. At this scale, 1 inch on the chart equals approximately 6.86 nautical miles on the ground. The name 'sectional' comes from the original system where the United States was divided into named sections, each covered by a single chart.
The FAA currently publishes 37 sectional charts covering the contiguous United States, plus additional charts for Alaska and Hawaii. Charts are updated every 56 days (approximately 6.5 times per year) to reflect changes in airspace, airport data, NOTAMs, and navigation facilities. Pilots must use current charts — an expired sectional is not legal for flight planning and may contain outdated airspace boundaries, closed airports, or decommissioned NAVAIDs.
The FAA sectional chart practice tests on PracticeTestGeeks simulate the figure-based questions that appear on the FAA Knowledge Test. These questions present a section of a real sectional chart and ask you to identify airports, read airspace altitudes, locate NAVAIDs, or determine latitude and longitude — exactly as the actual FAA test is structured.
Sectional charts are complemented by Terminal Area Charts (TACs), which cover busy Class B airspace areas at 1:250,000 scale (twice the detail), and World Aeronautical Charts (WACs) at 1:1,000,000 scale used for high-altitude VFR operations. For IFR flight, pilots use en route low-altitude and high-altitude charts instead of sectionals.
Sectional charts use a standardized symbol system defined in the FAA Chart User's Guide, which is available as a free PDF from the FAA's Aeronautical Information Services website. The legend printed on each sectional chart panel summarizes the most common symbols, but the full Chart User's Guide provides comprehensive explanations of every symbol type.
Airport symbols are among the most frequently tested. The key distinction on the FAA Knowledge Test is between controlled (tower) and uncontrolled (no tower) airports, and between hard-surface and soft-surface runways:
Obstruction symbols indicate tall structures that are aviation hazards. A tower symbol with a dot below it indicates an obstruction with high-intensity lights. The numbers printed next to obstruction symbols give the Mean Sea Level (MSL) elevation of the top of the obstruction, followed in parentheses by the Above Ground Level (AGL) height. For example, 1,549 (349) means the obstruction top is 1,549 feet MSL and 349 feet AGL.
Terrain elevation is shown through contour lines and color tinting. Brown contour lines indicate terrain elevation at regular intervals (typically 500 feet in mountainous areas, 250 feet in flatlands). The gradient shading goes from green (low elevation) through tan and brown to white and purple for the highest terrain. The maximum elevation figure (MEF) appears in each latitude/longitude quadrangle as a large bold number (in hundreds of feet MSL) representing the highest obstacle in that square.
Class A airspace covers the entire contiguous United States from 18,000 feet MSL (FL180) up to and including FL600. All operations in Class A airspace must be conducted under Instrument Flight Rules (IFR). VFR flight in Class A is not permitted. Class A is not depicted on VFR sectional charts since VFR pilots do not operate there. A Mode C transponder and IFR clearance are required.
Class B airspace surrounds the nation's busiest airports (similar to international 'TCA'). Depicted on sectional charts as solid blue lines in an upside-down wedding cake shape, with altitudes shown as two numbers: the upper limit over the lower limit (e.g., 100/SFC means from the surface to 10,000 feet MSL). ATC clearance, two-way radio communication, an operable transponder with Mode C, and a student or higher certificate are required. Student pilots need a specific logbook endorsement to operate in Class B airspace.
Class C airspace surrounds airports with an FAA operational control tower and at least one approach control radar. Depicted as solid magenta circles, typically in two rings: an inner ring from the surface to 1,200 feet AGL, and an outer ring from 1,200 to 4,000 feet AGL above the airport elevation. Two-way radio communication and a Mode C transponder are required. ATC clearance is not required (unlike Class B) but communication must be established before entering. Altitudes shown as ceiling/floor in hundreds of feet AGL.
Class D airspace is a cylinder, typically 4 nautical miles in radius, around airports with an operating control tower that do not qualify for Class B or C. Depicted as dashed blue lines on sectional charts. The ceiling is typically 2,500 feet AGL. Two-way radio contact with the tower must be established before entering, but no transponder is required unless the airport is within Mode C veil. Class D reverts to Class E or G airspace when the tower is closed (check operating hours in Chart Supplement).
Class E is controlled airspace that is not Class A, B, C, or D. It begins at 14,500 feet MSL nationally, and at lower altitudes around instrument approach corridors (shown as magenta dashed circles around airports with instrument approaches, starting at 700 feet AGL, or blue dashed lines starting at 1,200 feet AGL for en route Class E). No clearance or radio is required for VFR in Class E, but weather minimums are higher than Class G. Class G is uncontrolled airspace below Class E, typically from the surface to 700 or 1,200 feet AGL depending on location. No ATC communication is required in Class G.
Each airport on a sectional chart is accompanied by an airport data block that provides essential operational information. Reading these data blocks quickly and accurately is a core FAA Knowledge Test skill. The data block typically includes:
The CTAF (Common Traffic Advisory Frequency) is shown in a magenta box for uncontrolled airports — this is the frequency pilots use to announce their intentions when no control tower is operating. When a tower frequency is shown, that frequency also serves as the CTAF during tower hours.
Private airports are depicted with an 'R' in their symbol and their data blocks show '(Pvt)' — these require landowner permission to use and are not open to the general public without prior arrangement.
Navigation Aids (NAVAIDs) are ground-based radio stations that pilots use to determine position and maintain course. Sectional charts depict the two primary types of NAVAIDs used in VFR and IFR navigation: VORs and NDBs.
VOR (VHF Omnidirectional Range) — the primary enroute navigation facility in the US. VORs transmit on frequencies between 108.0 and 117.95 MHz. On sectional charts, a VOR is depicted as a compass rose (circle with degree markings) centered on its location, with the VOR name, frequency, Morse code identifier, and channel printed in a blue box. Three types exist: VOR (compass rose only), VOR-DME (VOR + Distance Measuring Equipment), and VORTAC (VOR + military TACAN). DME provides slant-range distance in nautical miles to the station.
NDB (Non-Directional Beacon) — older low-frequency beacons used with an Automatic Direction Finder (ADF). NDBs are depicted on sectional charts as a magenta circle with the station name, frequency (in kHz), and Morse identifier. NDBs are being progressively decommissioned by the FAA, so fewer appear on current charts compared to older editions.
The FAA NAVAIDs practice tests on this site cover VOR identification, frequency selection, and the interpretation of bearing information — topics that appear on both the Private Pilot and Instrument Rating knowledge tests.
VOR Federal Airways (Victor Airways) — low-altitude airways depicted as blue lines connecting VORs on sectional charts. Each airway is labeled with its designator (e.g., V-23) and the magnetic course. Airways extend 4 nautical miles on each side of the centerline and provide a structured route system from 1,200 feet AGL up to but not including 18,000 feet MSL.
Latitude and longitude identification is consistently one of the most-tested skills on FAA Knowledge Test figures. Questions typically show a sectional chart excerpt and ask you to identify the approximate coordinates of an airport, obstruction, or waypoint — or conversely, to identify which airport is located at given coordinates.
Reading the grid: Sectional charts are overlaid with a latitude/longitude grid. Latitude lines (parallels) run horizontally; longitude lines (meridians) run vertically. The lines are labeled at the chart edges. On sectional charts, tick marks subdivide each degree into 30-minute intervals along the borders, making it possible to estimate positions to the nearest few minutes.
Technique for FAA test questions: When given a figure and asked to identify coordinates, follow these steps: (1) Identify the nearest labeled latitude and longitude lines. (2) Count the subdivisions between the labeled lines and the target point. (3) Each degree = 60 minutes; each tick mark on a sectional edge = 30 minutes. (4) Estimate the fractional position between tick marks to arrive at approximate minutes. Practice this systematically across multiple figures — speed and accuracy improve rapidly with repetition.
Common exam scenario: 'Refer to Area 3 of Figure 21. Determine the approximate latitude and longitude of [Airport X].' The answer choices differ by 5–15 minutes of arc. Precise grid reading — not guessing — is required to distinguish between answer choices that look similar. The FAA flight planning practice tests include figure-based latitude/longitude questions to build this skill.
Beyond test preparation, sectional charts are working tools for real VFR flight planning. A complete preflight planning process using a sectional chart involves several key steps that pilots must complete before every cross-country flight.
Route selection: Draw or trace your intended route on the chart from departure to destination. Check for airspace along the route — any Class B, C, or D airspace you will penetrate requires ATC communication and, in some cases, a specific clearance. Note any TFRs (Temporary Flight Restrictions) from NOTAMs that are not depicted on the chart.
Terrain clearance: Check terrain elevation along the entire route. VFR regulations require minimum altitudes of 500 feet below clouds and 500 feet above obstructions (1,000 feet in congested areas, 2,000 feet laterally from mountains in some regulations). The Maximum Elevation Figure (MEF) in each quadrangle gives the highest obstacle plus a safety buffer — useful for selecting a cruise altitude that clears all terrain.
NAVAID selection: Plan which VORs or landmarks you will use to verify position en route. While GPS is now standard in most aircraft, cross-checking position against VORs and prominent landmarks remains a best practice and is required knowledge for FAA checkrides.
Fuel and performance: Measure route distance using the sectional's scale bar or a plotter. Calculate estimated flight time based on planned cruise speed and wind correction. Verify that planned fuel load provides the required reserves: 30 minutes for day VFR, 45 minutes for night VFR.