Plan the flight.
Print the kneeboard.
großkreis turns your route, aircraft, and weather into the numbers you actually fly — wind-corrected headings, ground speed, fuel burn, weight & balance — and lays them out on a kneeboard you can print.
Everything a VFR flight plan needs
One model for the whole journey — every value carries its source, its dependencies, and a note when it goes stale.
Wind triangle, per leg
Wind correction angle, true and magnetic heading, deviation, compass heading, ground speed, and leg time — computed from your forecast wind and the leg's true course.
Fuel that adds up
Trip fuel from leg burns, plus taxi, reserve, alternate, and contingency — in litres or pounds, your call. Reserve is required, never silently defaulted.
Weight & balance
Stations, arms, moments, and CG — checked against your aircraft envelope before you walk out to the apron.
Print-ready kneeboards
Every value lands in a typed slot on a PDF kneeboard template. Pre-fold, clip in, fly.
Sources you can trust
Every field tells you where it came from — user entered, from a datapack, computed, or overridden — and flags itself stale when its inputs change.
Works offline, runs everywhere
Native apps for desktop and mobile keep your journeys in a local database. The web build is a quick-look kiosk — no account, no tracking.
How it works
Three steps, one source of truth from input to printout.
Enter the journey
Aircraft, aerodromes, waypoints, wind, fuel policy. The wizard guides you through it, validates as you go, and never silently fills in safety-critical numbers.
See the numbers
The solver resolves the whole journey — per-leg headings, fuel, time, weight & balance — with each value showing its origin.
Print the kneeboard
Pick a template, preview the PDF, and print or share. The layout is sized for a clipboard at altitude, not a desk.