What VFR Cruising Altitude Should You Fly When Your Magnetic Course Is 090 Degrees?

Why Your Examiner Will Ask This Question

VFR cruising altitudes are one of those regulations that seem simple on the surface but trip up student pilots in surprisingly consistent ways during the oral exam. The question sounds almost too easy: you are flying a magnetic course of 090 degrees at 6,500 feet MSL — are you legal? The answer is no, and understanding exactly why will not only help you ace this question but will also build the kind of regulatory fluency your examiner is looking for. This rule comes directly from 14 CFR 91.159, titled VFR Cruising Altitude or Flight Level, and it applies every time you are flying more than 3,000 feet above the surface under VFR.

The regulation exists for a practical safety reason: traffic separation. By assigning eastbound and westbound aircraft to different altitude blocks, the FAA creates a predictable system that reduces the chance of head-on conflicts at cruise altitudes. Think of it as the airborne equivalent of driving on the right side of the road — it only works if everyone follows the same convention.

Breaking Down 14 CFR 91.159

The rule divides the compass into two halves. When your magnetic course falls between 0 and 179 degrees — the easterly semicircle — you must fly at an odd-thousand-foot MSL altitude plus 500 feet. That means 3,500, 5,500, 7,500, 9,500, and so on. When your magnetic course falls between 180 and 359 degrees — the westerly semicircle — you fly at an even-thousand-foot MSL altitude plus 500 feet: 4,500, 6,500, 8,500, and so on.

A magnetic course of 090 degrees is squarely eastbound, which puts you in the odd-thousand-plus-500 camp. That makes 7,500 feet the correct altitude if you want to cruise near 6,500 feet, or you could descend to 5,500 feet. Flying at 6,500 feet on an eastbound course violates 91.159 because 6,500 is an even-thousand plus 500 — reserved for westbound traffic. On your checkride, stating this clearly and citing the regulation by number will demonstrate exactly the kind of precision your examiner expects.

The Three Mistakes That Catch Student Pilots Off Guard

Even students who know the general rule stumble on the details. Here are the three most common errors to eliminate before you walk into that oral exam.

• Applying the rule below 3,000 feet AGL. Section 91.159 only kicks in when you are more than 3,000 feet above the surface. Below that threshold, no specific VFR cruising altitude is required by this regulation. Telling your examiner you would fly at 2,500 feet plus 500 feet is incorrect — the rule simply does not apply at low altitudes. Be precise about this boundary.
• Confusing magnetic course with magnetic heading. The regulation is based on your magnetic course — the direction of your intended ground track — not your magnetic heading. Wind correction will cause your heading to differ from your course, sometimes by a significant margin. If your magnetic course is 090 but you are heading 085 to compensate for a crosswind, you still apply the eastbound rule. Your examiner may specifically probe this distinction, so make sure you use the right terminology.
• Picking even-thousand plus 500 for eastbound flight. This is the most direct way to get the question wrong. Some students memorize the altitude increments correctly but flip which semicircle gets which set. A reliable memory aid: think of east as odd. Both words have four letters and an unusual quality — east is the direction of sunrise, something that stands out, just like odd numbers stand out from the even sequence. Whatever mnemonic works for you, lock it in before your checkride.

How to Answer This on Your Checkride

When your examiner asks this question, structure your answer to show both regulatory knowledge and practical application. Start by citing 14 CFR 91.159 and stating that it applies when operating more than 3,000 feet AGL under VFR. Then identify the magnetic course of 090 degrees as eastbound, placing it in the 0-through-179-degree range. State the requirement: odd-thousand plus 500 feet. Finally, apply it directly — 6,500 feet does not comply, so the correct options are 5,500 or 7,500 feet MSL.

That logical flow — regulation, category, requirement, application — shows your examiner you are not just recalling a memorized fact but actually working through the regulation the way a pilot-in-command should. Examiners notice the difference, and it builds confidence throughout the rest of the oral.

Fluency with regulations like 91.159 is the foundation of safe cross-country flying, and the checkride is your chance to prove that foundation is solid. If you want to practice questions like this in a realistic oral exam format, try SimulatedCheckride.com.