HPC Tier Module

MPM Trajectory + Grid Solution

Offline exterior-ballistics solver on the NATO STANAG 4355 Modified Point Mass model: axial spin and spin decay, Magnus force, equilibrium yaw of repose (spin drift), Coriolis, and the McCoy gyroscopic stability factor, integrated with RK4 through the US Standard Atmosphere 1976.

See it run - a worked example, 100% in this browser tab

What it is

Offline exterior-ballistics solver on the NATO STANAG 4355 Modified Point Mass model: axial spin and spin decay, Magnus force, equilibrium yaw of repose (spin drift), Coriolis, and the McCoy gyroscopic stability factor, integrated with RK4 through the US Standard Atmosphere 1976. Resolves the impact point as a geodetic fix - WGS84 latitude/longitude to 7 decimal places and the MGRS grid reference - with no network, no map service and no positioning input. Open-loop trajectory prediction: it is not navigation, not guidance, and not a resolved-spin 6DOF (the spin phase is averaged analytically, which is what makes a fire-control-rate solution possible).

Honest scope

Deterministic and citation-backed: every figure is exact arithmetic or a cited rule. Any year- or jurisdiction-indexed value is a confirmable input, never an eternal hardcode. This is a computation tool, not professional (legal, tax, medical, or financial) advice - confirm against the controlling authority for your context.

Authorities cited

Run it on your own data

Open it inside GDBS to save runs to Sandbox, attach results to a Worklog case, or share through a Gate client portal - all in the browser, nothing uploaded to anyone’s cloud.

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