Before you can build a navigation log you have to read the map. The ICAO 1:500 000 VFR chart packs airspace, aerodromes, terrain, obstacles and frequencies into one standardised picture — and the exam shows you an excerpt and asks you to pull facts out of it. This lesson is that skill.
1 — One Standard Chart, One Set of Symbols
The half-million chart (1 cm = 5 km) is the workhorse of VFR navigation. Its symbols are set by ICAO, so the same shape means the same thing on the Austrian, German or any other State’s sheet — learn them once and you can read any of them.
Every symbol is standardised by ICAO, so the same shape means the same thing on any State’s chart. Read the airspace limits, the aerodrome block and the MEF before you draw a single line.
2 — Airspace: Classes, Boundaries and Vertical Limits
Airspace is the first thing to extract, because it decides where you may fly and who you must talk to. Controlled airspace is drawn with coloured boundaries, each labelled with its class and, crucially, its vertical limits — a ceiling over a floor:
FL95 / 2500 MSL— a block from 2 500 ft altitude up to flight level 95.FL95 / GND— from the ground up (a CTR).- Danger, restricted and prohibited areas carry an identifier and upper limit (e.g.
LO-R5 / FL120); check whether they are active in the AIP/NOTAM before routing through.
3 — Reading an Aerodrome
Each aerodrome has a data block beside its symbol. For planning a departure, destination or alternate you extract:
- Elevation in feet — feeds your altimetry and density-altitude sums.
- Runway — length (printed in tens or hundreds of metres) and orientation, with the declared distances (TORA / TODA / LDA) read from the AIP for the real go/no-go.
- Frequency — the tower, info or FIS frequency to call.
- Annotations — symbols for fuel, customs, PPR or a non-public field, plus any glider or parachute activity nearby.
4 — Terrain, Obstacles and the MEF
VFR means staying clear of the ground, so the chart’s terrain information keeps you alive:
- Spot heights (a dot with a number) and obstacle symbols (a tower with its top elevation in ft AMSL) mark the high points; lit obstacles add rays.
- The big blue Maximum Elevation Figure (MEF) in each lat/long quadrangle gives the highest terrain or obstacle in that box, in hundreds of feet —
38means 3 800 ft. It is your quick floor for a safe cruising altitude. - To find the highest obstacle within a corridor, scan the boxes your route crosses and take the largest MEF — then add your terrain-clearance margin.
5 — Measuring Track and Distance
The chart turns a planned route into numbers. With a plotter and the printed scale:
- True track — lay the protractor along the leg against a meridian (a line of longitude); read the angle. That is the true track.
- Magnetic track — apply the variation from the nearest isogonal line (the dashed magenta lines of equal variation): East is least, West is best.
- Distance — measure along the leg with the chart’s scale (or the latitude scale, where 1’ of latitude = 1 NM).
These are exactly the true and magnetic track numbers the navigation log starts from — you are reading the inputs the next lesson turns into headings and times.
6 — Why Study the Departure Procedure
Before you fly out of an aerodrome, read its visual departure and arrival procedures (from the chart and the AIP). They exist for real reasons:
- Obstacles and terrain on the climb-out;
- Airspace you must avoid or contact immediately after take-off;
- Noise-abatement routes over built-up areas;
- VFR reporting points (VRPs) and circuit direction that keep you predictable to others.
