Vanilla Arma Reforger mortar

M252 Mortar Calculator for Arma Reforger

The M252 is a vanilla Arma Reforger mortar: the gunner sets a number of rings and an elevation, and reads azimuth on the 6400 mil scale. Reforger FDC returns all three from the gun and target positions.

Open the calculator

Operator setting

4 rings

Azimuth

637 mil

Elevation setting

1204 mil

Time of flight

33.9 s

A solution read off the app, not an example: Everon, gun at X4922 Y4868 and 89 m, target at X6100 Y6500 and 167 m. Range 2013 m, height difference +78 m, high trajectory, 6400 mils per circle.

What the calculator computes for the M252

From two points it takes range and azimuth, picks a ring count that covers the range, and returns the elevation and the time of flight. Where several charges reach the target, the other solutions stay in view. The difference is real: at 400 metres zero rings arrives in about 11 seconds and four rings in about 36, while the larger charge changes elevation more slowly with range, so an error in range costs less.

The altitude difference between the position and the target comes from the map terrain and is applied to the elevation. The correction is derived from the shape of the table itself and was confirmed in game on 31 August 2026 by nine hundred engine predictions at three launch heights. The table column once taken for a height coefficient plays no part in it: the measurement disproved that column. Where the angle of fall is below five degrees the application refuses to compute the correction and says so, because on such a flat branch the formula returns a plainly wrong number and a refusal is more honest than an approximation. The M252 tables carry wind coefficients, and that correction is applied where the direction and range fall inside verified values. Where they do not, the application says the correction is missing and leaves the solution without it.

Things that catch people out

• The M252 azimuth scale is 6400 mils, while the 2B14 uses 6000. A number taken from one gun is wrong on the other, and the application always works in the unit that belongs to the selected weapon.
• There is no combat table below 100 metres, so a target that close has no solution. That is the table ending, not bad input.
• Smoke and illumination start at 200 metres and stop short of the HE round, so changing the projectile can remove a solution that was there a moment ago.
• The table here is the vanilla one. A mod such as Adult Mortars rewrites mortar ranges and dispersion wholesale, and on a server running it these numbers fit no range at all. The sources page shows what changes.

Which mortar calculator you need

Arma Reforger has two vanilla mortars, and the Tactical Flava mod adds a third. They look alike on the map and share nothing in the table, so the first thing any mortar calculator has to get right is which weapon it is computing for.

Height matters more on fewer rings. In the readout above the target stands 78 metres higher than the gun: on four rings that moves the elevation by 6 mils, on three rings by 20. A calculator that ignores the height difference is off by that much before the first round lands, which is why the heights here come from the map terrain.

How to open the M252 in the application

1. Open Reforger FDC with this gun already selected and choose the map workflow or the coordinate one.
2. Check that the weapon block shows the M252, then pick the projectile you need.
3. Place the gun point and the target point; heights come from the terrain.
4. Read the rings, azimuth, elevation and time of flight, then mark the impact to get a correction.