FAQ
Where do the Vietnam mortar values come from?
From community measurement, cross-verified: the full angle/range chart circulating publicly and independently published worked examples agree point-for-point (e.g. 175 m → 67°, 225 m → 49°). We publish nothing single-sourced. If future readings disagree, the chart gets corrected — with credit to reporters.
Do the classic Hell Let Loose values work in Vietnam?
No. Vietnam mortars aim by barrel angle in degrees across a 100–450 m envelope; classic HLL artillery aims in mils across 100–1600 m. They are different weapons with different dials. Classic values live on our classic calculator page.
Are US and NVA mortar tables different?
No — the in-game aiming panel shows the same table for both factions (community-confirmed). One chart covers everything.
The game already shows a range table while aiming — why use this?
Three cases the in-game panel doesn’t cover: you’re playing observer (or planning before deploying the tube), you want the reverse lookup (current angle → where shells land), or your ping falls between the 25 m rows and you want the interpolated angle instead of eyeballing it.
Is this site official?
No. FireMission is an unofficial fan-made tool, not affiliated with the developers or publisher. It’s free and has no login.
How do I share my calibration with my squad?
Use the Copy share link button — it encodes your readings into the URL. Anyone opening the link gets your fitted range card instantly.
Something else? Contact us here.