The CR3 is an air navigation computer that lets you solve speed, time, distance, fuel consumption and wind correction problems without an electronic calculator.

How do you use the CR3 online?

Select the type of exercise, rotate the inner disc to align the known values on the scales and read the result on the outer scale. The interactive tutorial guides you step by step.

Is the CR3 online calculator free?

Yes. The AerotestPPL CR3 online is free and runs directly in your browser, with no installation.

CR3 Online: solve air navigation exercises with a step-by-step tutorial

This is a free CR3 online: an interactive tool that reproduces the CR3 air navigation computer directly in your browser, with no installation. It is designed in a didactic way so you learn to solve exercises step by step with a built-in tutorial, ideal for Private Pilot Licence (PPL) students.

What is the CR3 used for?

With the CR3 calculator you can solve the typical air navigation problems: speed, time and distance calculations, fuel consumption, unit conversion and wind correction (heading and ground speed).

CR3 tutorial step by step

Choose the exercise you want to solve (speed, time, distance, fuel or wind).
Rotate the inner disc of the CR3 to align the known values on the scales.
Read the result on the outer scale of the CR3.

Practise without limits with this CR3 online and prepare your PPL theory exam at AerotestPPL. Versión en español.