ASA CX-3 Long-Term Review: The Checkride Calculator

Every student eventually stands in the pilot shop holding a metal E6B in one hand and an ASA CX-3 in the other, doing the math: the electronic one costs roughly three times as much. Is it worth it? The honest answer is that they solve the same problems in different ways, and the right pick depends on what you value under pressure. This review works from the feature set, the way the device is actually used through training, and the consensus among students and instructors, not from a bench test we did not run.

What the CX-3 is

The ASA CX-3 Pathfinder is an electronic flight computer: a dedicated handheld calculator built to do the aviation math a whiz wheel does, but with a screen and menus instead of a rotating disc. It handles the core computations a student needs, including wind correction and groundspeed, true airspeed, density and pressure altitude, fuel burn and endurance, the time-speed-distance family, weight and balance, and holding pattern entries, with unit conversions built in.

It runs on standard AAA batteries, fits in a flight bag pocket, and is a purpose-built device rather than a phone app, which is part of the appeal: it keeps working when your tablet dies, and it is legal to bring into testing environments where a phone is not.

Why students buy it

Two reasons dominate. First, it is on the short list of calculators generally accepted for FAA knowledge testing, being a simple, non-programmable, purpose-built aviation computer, though you should always verify the current testing policy and clear any memory before a written. Second, and more day-to-day, it removes fumbling. Working a wind problem on a mechanical E6B while an examiner watches, or against the clock on a written, is a real source of dropped points, not because the student does not understand the concept but because the disc is fiddly under stress. The CX-3 turns that into keystrokes.

For a lot of students the CX-3 is a composure purchase. If you are the kind of person who freezes when a whiz wheel slips at the wrong moment, spending the extra money to make the calculation boring can be worth it. Check today's price on the ASA CX-3 if that is you.

Where it shines

The strengths are consistent across owner reports:

• Speed. Once you know the menus, computations are faster and less error-prone than the mechanical equivalent, which matters on a timed written and under checkride pressure.
• Fewer errors. The device does not care if you are nervous. Enter the numbers correctly and the answer is correct, with unit conversions handled for you.
• Testing-friendly. As a simple, non-programmable aviation calculator, it is generally accepted where phones and programmable calculators are not. Confirm the current policy for your specific test.
• Independent of your tablet. When the electronic flight bag battery dies on a cross-country, a dedicated calculator in the bag is a genuine backup. It does one job and does not share a failure mode with your phone.

Where it falls short

It is not a clean win, and the honest weaknesses matter:

• Batteries. It needs them, and a dead CX-3 is a paperweight. Carry spares, especially to a checkride.
• It can paper over understanding. If you only ever punch buttons, you may not truly grasp the relationships the computations represent, which the oral exam will probe and which make you a better pilot. Instructors who prefer the mechanical E6B do so precisely because the wheel makes the physics visible.
• Learning curve. The menus take practice. Buy it early enough that you are fluent before test day, not the week before.
• Diminishing returns after training. Once you fly with an electronic flight bag daily, most of these computations move to the tablet, and the CX-3 becomes a backup you rarely open. That is fine, but it means the heaviest value is concentrated in the training-and-testing window.

The metal E6B counterpoint

The mechanical E6B is not a lesser product, it is a different philosophy. It never needs batteries, it never crashes, it costs a fraction as much, and it teaches the underlying relationships every time you use it because you are physically lining up the numbers. Many, many pilots pass every test they ever take with nothing but the wheel, and a large share of instructors quietly prefer their students learn it that way first.

There is also durability and sentiment: a metal whiz wheel lasts a lifetime and is the tool your instructor probably learned on. If you want the honest minimalist path, or simply a bulletproof backup to keep in the bag forever, check the price on an ASA E6-B metal flight computer. Even committed CX-3 owners are well served by knowing how to work the wheel.

The verdict

Buy the CX-3 if you want speed and error-proofing for the written and the checkride, you can afford roughly three times the price of a wheel, and you know yourself well enough to admit that fumbling a mechanical computer under pressure would rattle you. It is a composure-and-time tool, and in the compressed, high-stakes window around your knowledge test and practical test, that is worth real money to a lot of students. Buy it early, learn the menus cold, and carry spare batteries. Check the current price on the ASA CX-3.

Skip it, and buy the metal E6B, if you are on a budget, you want to genuinely internalize the relationships, or you simply prefer a tool that never runs out of power. The wheel is the honest minimalist choice, and you should be able to use one regardless of what else is in your bag. The pragmatic answer many pilots land on is both: the CX-3 for the test season, the wheel for understanding and as an unkillable backup.

Long term, expect most of your day-to-day math to migrate to your tablet after the checkride, with the CX-3 living in the bag as a well-regarded backup that also holds its resale value. For the season around the practical test, our checkride packing guide covers what belongs in the bag that morning, and if the calculator is a gift for a new pilot, our first solo gift guide covers the rest of the occasion. If you are still choosing a headset for the same pilot, our budget headset comparison breaks down the entry tier.