großkreis
VFR flight planning

Plan the flight.
Print the kneeboard.

großkreis turns your route, aircraft, and forecast winds 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.

Open großkreis See what it does

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.

  • You
  • Datapack
  • Computed
  • Override
  • Stale
  • Missing
  • Invalid

Wind triangle, per leg

Enter true course and forecast wind; großkreis computes the headings, speed, and leg time.

Fuel that adds up

Fuel is totaled by phase, including reserve, and compared with what is on board.

Weight & balance

Masses and arms resolve into take-off weight and moment, with missing values called out.

Print-ready kneeboards

VFR flight logs pre-filled with the computed values, ready to print or share.

Sources you can trust

Every value shows its source and turns stale when an input changes.

Works offline, runs everywhere

Native builds store journeys locally; the web build stays account-free and in memory.

How it works

Three steps, one source of truth from input to printout.

Step 01

Enter the journey

Add aircraft, route, wind, weights, and fuel policy in a guided wizard.

Step 02

See the numbers

The solver resolves headings, fuel, time, and weight & balance with source labels.

Step 03

Print the kneeboard

Pick a template and print a cockpit-friendly PDF.

Native Android app

Built for the briefing room, not just the browser

A native Android build is the full großkreis: your journeys are saved on the device, your defaults and the data packs travel with you, and everything keeps working with no connection. The web app stays the zero-install way to try it — but it only holds your work for the current session.

  • Journeys that persist

    Stored on your device and waiting next time — the web app forgets everything when the tab closes.

  • Plans without a connection

    Enter routes and recompute fully offline — no signal required, wherever you sit down to brief.

  • Defaults that fit you

    Set your usual reserve, home field, aircraft, and pilot once; every new journey starts pre-filled.

  • Browse the data packs

    Tap through the bundled aircraft and aerodromes — cruise-performance tables, runways, frequencies, and elevations.

  • An app on your phone

    Installed for an instant, full-screen launch, with native printing and sharing for your kneeboards.

Your next flight is a few inputs away.

Open großkreis, build the journey, and watch every number resolve — each one carrying its source, ready for the kneeboard.

Open großkreis