Charts and Darts: Why FDC Still Trains on Paper When AFATDS Goes Down

The Advanced Field Artillery Tactical Data System — AFATDS — automates the technical fire direction problem that used to eat up most of an FDC section's time: turning a target location and a gun position into the deflection, quadrant, and charge that actually put a round where it needs to go. It's fast, it's accurate, and on a modern gun line it's the default tool for a reason.

It's also a computer, running on a network, in an environment where computers and networks are exactly the kind of thing a competent enemy tries to break. Which is why every FDC section still trains on the manual backup: the firing chart.

A manual FDC runs two charts in parallel. The horizontal control operator (HCO) maintains the primary firing chart, plotting gun and target locations to scale. The vertical control operator (VCO) maintains a second, independent check chart, along with a 1:50,000-scale situation map with the current tactical overlay. Charts get built one of two ways — a surveyed firing chart, built from confirmed survey data, or an observed firing chart, built and refined as actual rounds land and get adjusted. Either way, the output is the same: chart range, chart deflection, and angle T, converted into a firing solution using nothing but the chart, a set of gunnery tables, and trained hands.

"Charts and darts" is the nickname that's stuck to this whole process — the chart itself, and the pins or plotted points marking gun and target locations on it, tracked and adjusted mission after mission entirely on paper. Even with AFATDS running normally, most sections keep a secondary automated check running too — systems like CENTAUR exist specifically as a lightweight backup ballistic calculator, a second layer of verification before AFATDS and the manual chart.

None of this is nostalgia. It's redundancy, built in on purpose. If AFATDS goes down — jammed, damaged, or just dead from a bad update at the worst possible moment — the mission doesn't stop. The HCO and VCO are already tracking the same data by hand, and the guns keep firing on chart data while someone works the technical problem. That's the entire point of training a skill the computer was supposed to make obsolete: the day it actually goes obsolete is the day you needed it most.

See it on a gun line in our AFATDS Death Tee, or gear up the whole section with the FDC Starter Pack.

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