NCAA PPL Navigation common mistakes
NCAA PPL Navigation · Understand the traps and how to avoid them.
Computing a true course from the sectional but forgetting to apply magnetic variation before plotting, then flying the true value as a magnetic heading.
Sectional charts state variation in the legend and compass rose, but candidates trained on a single local area assume variation is negligible or zero; the true-to-magnetic conversion is the step most easily skipped under time pressure.
What to do instead
Adopt a fixed checklist order: true course from chart, then variation (east subtract, west add) to get magnetic course, then wind correction, then deviation to get heading. Write each intermediate value on the plog so a skipped step is visible.
Applying wind correction in the wrong direction, so the heading is turned away from the wind instead of into it.
The wind triangle is usually solved by rote with a flight computer, and candidates who do not sketch the triangle lose track of which side the wind pushes the track toward.
What to do instead
Always draw the wind vector on the plog before using the E6B, and sanity-check: if the wind is from the left, the heading must be left of the course. Verify with the computer's wind side and confirm the sign of the correction angle.
Reading the wrong scale or wrong tick spacing from the plotter when measuring a course, producing a 5-10 degree error that later compounds.
Plotters have multiple scales and a rotating azimuth ring; candidates line up the wrong edge or read the inner scale, and small charts make the error easy to miss.
What to do instead
Use the scale printed for the chart (1:500,000 for sectionals), align the plotter's center hole on a meridian, and read the angle twice from opposite ends. Cross-check by measuring the same leg with the other plotter edge.
Mixing statute miles and nautical miles when computing time, fuel, or distance from the chart scale.
Sectional scales are in statute miles while airspeed and fuel burn are in knots and nautical miles; candidates grab whichever number is convenient and never convert.
What to do instead
Standardize every leg on nautical miles: convert the chart's statute-mile measurement (1 nm = 1.15 sm) before filling the plog, and label each column with its unit so a mismatch is obvious.
Ignoring magnetic deviation and using the magnetic course directly as the compass heading.
Deviation is airplane-specific and is often taught as a minor correction, so candidates omit it or apply it in the wrong direction when the card shows east or west deviation.
What to do instead
Read the compass correction card for the actual airplane, apply deviation after variation (east subtract, west add), and note that deviation varies with heading. State the final compass heading explicitly on the plog.
Failing to update the estimated time of arrival and fuel remaining after an unplanned headwind or a diversion, continuing with the original flight plan figures.
Candidates treat the plog as a one-time calculation rather than a live document, and in-flight workload makes recomputation feel optional.
What to do instead
At each checkpoint, compare actual ground speed and fuel to plan; if the error exceeds about 10 percent, recompute remaining legs and ETA. Carry a pre-drawn diversion line and the formula for time and fuel to the alternate.
Misidentifying the destination or checkpoint because the candidate matches a town or road instead of confirming the chart symbol, elevation, and runway layout.
Sectionals are dense with similar-looking symbols, and pilots flying by dead reckoning latch onto the first feature that fits rather than verifying multiple cues.
What to do instead
For each checkpoint, list at least two independent identifiers (e.g., airport elevation plus a nearby railroad junction) and confirm the airport symbol type and runway orientation. If cues conflict, hold heading and re-verify before turning.
Flying the planned heading without correcting for actual wind, drifting off course and not noticing until the checkpoint is well past the wingtip.
Candidates assume forecast winds are accurate and do not use a deliberate drift-correction technique, so they never measure the off-course angle.
What to do instead
Use the opening-angle method: when the checkpoint appears off the nose, estimate the angle, double it, and turn that many degrees toward the checkpoint to intercept. Note the correction on the plog for the next leg.
Computing fuel for the leg only, omitting taxi, climb, reserve, and alternate fuel, and then treating the result as adequate.
The plog's leg time is the most visible number, and candidates conflate enroute fuel with total required fuel under the regulations.
What to do instead
Build fuel from the bottom up: taxi, climb to cruise, cruise legs, descent, alternate, and the required reserve (VFR day/night). Compare total usable fuel to total required and record the margin before departure.
Misreading the chart's maximum elevation figure or obstacle data, planning a cruise altitude that is below terrain or obstruction clearance along the route.
The maximum elevation figure is a small boxed number easily overlooked, and candidates confuse it with the highest airport elevation or with a single quadrangle's terrain.
What to do instead
Read the maximum elevation figure in each quadrangle crossed, add the required clearance, and check for obstacles along the planned track and within the lateral buffer. Confirm the chosen altitude against both the MEF and any depicted obstructions.