Purpose:

Our pilot's multitool.
Lots of fuel calculations, such as tankering, fueling for 2 legs, density, fuelcheck etc. at your fingertip. Paired up with a spin wheel MOTNE and snowtam decoder and a time calculator for adding up your flighttime.
But best of all: A unique wind limit tool that shows your cross- and tailwindlimits, together with a fast assessment of what winddirections and -speed you can accept from the tower. Simply by moving two sliders.