I have the main unit.
type Flight computer
country USA
power 3 * AAA batteries
Sporty’s E6B Flight Computer — Aviation’s Essential Calculator
The Sporty’s E6B Flight Computer was an electronic version of the E6B flight computer — the circular slide rule that pilots have used for navigation calculations since Charles Lindbergh’s era. The E6B calculates wind correction angles, true airspeed, fuel consumption, time-distance calculations, and density altitude — the core calculations that pilots perform during flight planning and in the air. Sporty’s electronic E6B replaced the traditional mechanical circular slide rule with a dedicated electronic calculator, providing faster and more accurate results while maintaining the familiar E6B calculation modes. Aviation calculators like this represent a specialised category of handheld computing that serves a critical safety function.