The Most Advanced Jump Run Calculator Available

Your complete jump run, brought to life

Other calculators stop at a line on a flat map. DZone Altitude brings the entire jump run to life over real ground, with elevation, contours and surrounding terrain.

Use the plan view for the familiar overhead picture, explore the terrain in 3D, or preview the run from the aircraft door. You can even see where the sun will be at jump time.

It is the closest you can get to flying the jump run before the aircraft takes off.

Precision beyond a simple wind average

Basic calculators average a few wind levels and assume a typical freefall. That is useful for a quick estimate, but it can miss what is happening between those levels.

DZone Altitude models the descent through the full wind profile. The advantage becomes clearest in strong or changing winds, when a simple average can hide the layer creating the most drift.

The result is a sharper exit point and a far clearer picture of what the winds will do to every group on the load.

Canopy range that reflects the real wind

Canopy range is not a circle. Wind changes how far you can travel in every direction, and that range shifts as you descend.

See the areas you can comfortably reach, the margins, and the places you are unlikely to make it back from. Set your wing loading and glide ratio and the map responds to your canopy and the conditions — something a simple radius can never do.

A cutaway finder that reads your FlySight

Other cutaway tools start from a guess. Load your FlySight or GPX track and the Cutaway Finder starts from the jump you actually flew: where and how high you cut away.

It maps search areas for your main and freebag, with distance and bearing from the drop zone, and shows your whole flight in 3D. No FlySight? Tap where you cut away instead. Your track never leaves your device.

Built for the whole day

• Plan for last light. See the useful limit for the final load, not just the sunset time.
• Map the whole load. Add groups, break-off heights and exit delays to visualise drift and separation in order.
• Use local DZ winds. Where a drop zone uses DZone, load the wind layers it publishes directly.
• Keep working offline. Add it to your home screen for use on airfields with unreliable coverage.
• Read it outdoors. The display is made for bright conditions, and important information never depends on colour alone.

Getting started

1. Open the calculator and allow location access. At a supported drop zone, it can load the local winds and imagery for you.
2. Elsewhere, use forecast winds for the selected location or edit any layer manually.
3. Set your exit altitude, opening height, wing loading and glide ratio.
4. Add your groups in exit order to see how the load separates.
5. Check the result in plan, 3D or first-person view.

What it assumes

• Canopy range is calculated on full-drive speed. Using brakes or rear-risers can increase your glide ratio to help make it home.
• The dashed freefall drift line is wind throw only. Add exit groups to simulate the freefall drift and movement probability areas of each type.
• In high winds that exceed the canopy's airspeed, reachability is determined by facing directly into wind and accounts for forward flight at lower levels. This area is shaded pink.
• Does not consider any ground terrain features that may inhibit certain run-in directions at your drop zone.
• Cutaway search areas assume the gear drifts freely with the wind. Gear that tangles or snags can land outside them.

Freefall exit-separation modelling draws on Exit Separation, a thesis by Steven Geens (Australian Parachute Federation, 2003).

Common questions