ATMACA vs Exocet MM40 Block 3: Same Range Class, Two Different Procurement Logics

Two missiles, one bracket

Anti-ship warfare has asked the same expensive question for forty years: how does a frigate hit something it cannot see? The answer has stayed remarkably stable — a low-flying cruise missile with a small radar cross-section that finds the target with its own seeker in the last stretch. The most recognisable expression of that formula is the French Exocet. Türkiye’s answer is ATMACA.

Put the two side by side and the first surprise is how close they read. Roketsan gives 250 km. MBDA advertises a “250 km class operational range.” The DGA fact sheet for the same French missile says “max. range: 200 km +.” That is not an error; it is what happens when a manufacturer publishes the best case and a procurement agency publishes the guaranteed one. Range depends on launch altitude, cruise profile, waypoint count and the terminal manoeuvre — which is precisely why it is the wrong row to judge these weapons on.

What the manufacturers actually publish

ATMACA — Roketsan

Roketsan is unusually forthcoming. The English catalogue lists 5.2 m length, 750 kg weight, 370 mm diameter and a 220 kg high-explosive blast-fragmentation warhead with effective penetration. The product page widens the length to a 4.3–5.2 m band, pointing to different launcher and platform configurations.

Guidance runs in two layers. In cruise, an inertial navigation system works alongside anti-jam satellite navigation, a barometric altimeter and a radar altimeter. That last item matters more than it sounds: it sets how close to the sea surface the missile flies, and therefore how late the target’s radar sees it. In the terminal phase the catalogue names an imaging infra-red seeker together with a radio frequency seeker, while the product page lists the seeker simply as “Active RF.” Both official readings are shown in the table below rather than reconciled.

The most telling line, though, is the platform list: naval platforms, submarine platforms, a fifth generation fighter jet, tactical wheeled land platforms and a fixed launcher. ATMACA is not described as a shipboard missile that might later be adapted. It is described as a family from the start — KARA ATMACA for the land-based role, AKATA for submarine launch, the latter already in Turkish service with a range Roketsan puts beyond 250 km.

Exocet MM40 Block 3c — MBDA

MBDA calls Block 3c “the latest generation ship-borne variant within the EXOCET family” and an all-weather maritime superiority system with land attack capability. The headline technical claim is the seeker: a new-technology J-band active coherent seeker with adaptive search patterns, improving detection, selectivity and ECCM at once.

The word “coherent” carries weight. A coherent seeker exploits the phase of the returned signal, not just its strength, which makes separating a real hull from a jammer or a decoy considerably easier. Naval News reported MBDA describing improved EW resilience and accuracy as the biggest difference from Block 3, with deliveries to the French Navy already under way and the first realistic-scenario firing conducted by the air-defence FREMM Alsace.

The DGA fact sheet supplies the dimensions: 6 m long, 0.5 m in diameter, one-tonne class, high subsonic. The ministry’s own web page lists 780 kg, 350 mm and under 6 m for the same weapon — most likely the difference between a round measured with and without its canister and booster. Both official values appear in the table.

MBDA also stresses something no datasheet number captures: Block 3c’s launcher and mission planning installation remain interoperable with Block 3, and it shares the same logistics support assets. For a navy already operating Exocet, the upgrade does not touch the ship. That is the compound interest of a fifty-year family.

Where the mission concepts diverge

Technically the two weapons speak the same language: low-altitude cruise, active radar terminal guidance, 3D waypoint planning, land attack capability and coordinated multi-missile arrival. That convergence is the modern anti-ship grammar, and both designs sit inside it.

The first real divergence is seeker architecture. Roketsan’s catalogue pairs an imaging infra-red channel with a radio frequency channel; MBDA builds Block 3c around a single but state-of-the-art radar seeker. A dual-mode seeker offers a second way of seeing when the radar channel is contested. A mature single-mode seeker brings decades of threat libraries and software refinement. They manage different risks from different directions — not one being better than the other.

The second is how multi-platform capability is achieved. In the Exocet family each platform is a separate product: AM39 from the air, SM39 and the newly unveiled SM40 from submarines, MM40 from ships, plus a coastal defence system. That is fifty years of layering. ATMACA writes multi-platform use into a single product description instead, trading proven variant diversity for shared infrastructure economics.

The third is maturity, and it is the one Türkiye cannot shortcut. Exocet has been fired in combat, maintained across many fleets, and had its faults found and fixed. MBDA lists “combat proven” first among its operational advantages, and that is more than marketing — knowing how a weapon behaves in real conditions is data no laboratory produces. ATMACA is still accumulating it.

Technical comparison

All figures are taken from documents published by the manufacturers and official agencies. Where two official sources give different values for the same item, both are shown.

Operators and the operational picture

Exocet’s customer base is broad and current. The DGA states that MM40 Block 3c will equip the French Navy’s FREMM, FDA/Horizon and FDI first-rank frigates, and Naval News reported an additional French order in April 2024. In April 2025 Greece signed an intergovernmental agreement with France for 16 MM40 Block 3c rounds — with land attack capability — for the final pair of Roussen-class fast attack craft, HS Karathanasis (P78) and HS Vlachakos (P79), at an estimated €33 million.

ATMACA’s declared operator is the Turkish Navy. Roketsan says the missile integrates with assault boats, corvettes and frigates, and that the first national anti-ship firing came from TCG Kınalıada. Add KARA ATMACA and AKATA and the result is less a single anti-ship missile than a strike family built around a common airframe.

Both systems are therefore present in the Eastern Mediterranean. The framing matters, though: an anti-ship missile does not settle an equation by itself. Something has to find the target, classify it and pass the track to the missile in time — maritime patrol aircraft, unmanned systems, satellites, electronic support measures and a combat management network. Any comparison that stops at the missile stops too early.

Limits of this comparison

The sharpest limit is asymmetry of disclosure. Roketsan publishes warhead weight, diameter and seeker architecture; MBDA and the DGA publish neither a warhead figure nor a propulsion type for Block 3c. Several rows are therefore one-sided, and nothing should be inferred from them.

The second limit is that official sources disagree with each other on the same weapon — Exocet’s mass is one-tonne class on the DGA sheet and 780 kg on the ministry page; ATMACA’s length is 5.2 m in the catalogue and a 4.3–5.2 m band on the product page. Reducing either to a single number would misrepresent the source.

The third is that none of the public material addresses the parameters that actually decide outcomes: probability of hit, performance against specific countermeasures, or effectiveness by target class. Those are classified, so any open comparison necessarily stays at the level of declared capability.

What it means for Türkiye

ATMACA’s significance runs wider than one missile entering service. Building an anti-ship cruise missile means making cruise guidance, a radar altimeter, a terminal seeker, a warhead and mission planning software work as one chain — and few countries close that chain domestically.

It also matters that the family was designed as a family. KARA ATMACA and AKATA extend the same airframe to land-based strike and submarine launch, spreading development cost and concentrating training and resupply on a single line — reaching by design the place Exocet reached variant by variant over five decades.

Finally there is the link to indigenous ships. The striking power of MILGEM corvettes, I-class frigates and fast attack craft depends on what they carry. A nationally built hull does not deliver freedom of action while the weapon rack remains imported. ATMACA closes that side of the equation — and in a theatre where several navies field missiles of the same range class, the decisive variable is increasingly the reconnaissance and electronic warfare network feeding them, not the round itself.

Assessment