The city shield that would sink your warship

In short: a warship and a city face missiles at completely different ranges, angles, and speeds, so they need different interceptors. A city buys reaction minutes behind a fixed radar horizon, while a ship gets seconds against a sea-skimmer that pops over the water at the last moment. That gap is why every serious navy stacks its own close-in layers instead of borrowing a land shield.

The horizon is the whole problem

A radar on a ship mast sits maybe 20 meters above the water. Against a missile flying 5 meters above the waves, that mast sees the threat only around 30 kilometers out. A sea-skimmer at Mach 0.9 covers that in roughly 90 seconds. A city radar on a hill or a tower watches a much larger sky and often gets several minutes of warning. Same missile, radically different clock.

קראו גם: Point Defense and Area Defense Are Not the Same Weapon With a Bigger Rocket · David’s Sling: the interceptor that stops what Iron Dome was never built to catch · Why Iron Dome Doesn’t Fire at Every Rocket

This is the core reason point defense is a distinct problem, not just a smaller version of area defense. A bigger rocket does not fix a 90-second window.

Point defense versus area defense at sea

Area defense protects a zone and other ships around you, reaching out 40 to 150 kilometers with weapons like Standard Missile or Aster. Point defense protects one hull, the last few kilometers, when everything else has leaked through. A city can lean almost entirely on the area layer because its threats arrive high and predictable. A ship cannot, because the sea-skimmer defeats exactly that early-warning advantage.

The last line: close-in weapon systems

When a missile is 2 kilometers out and closing at 300 meters a second, only automated hardware reacts fast enough. A close-in weapon system like the Phalanx fires a 20mm Gatling at up to 4,500 rounds a minute, radar-tracking both the target and its own stream of shells to walk the burst onto the missile. Newer ships add Rolling Airframe Missile launchers that throw 21 interceptors at incoming threats before the gun ever opens up.

Naval layers usually run in this order:

• Long-range area SAMs engaging at 40 to 150 km.
• Medium-range interceptors closing the 10 to 40 km band.
• Short-range missiles like RAM or Sea Ceptor inside 10 km.
• A gun-based CIWS for the final 2 km hard kill.
• Soft kill: chaff, flares, and radar decoys to spoof the seeker.

Why the city shield does not transfer

Land interceptors are tuned for their own geometry. The logic behind David’s Sling is built around threats arcing over a defended area with useful warning time, the same assumption baked into land-based short-range air defense. A ship’s threat hugs the water and arrives almost flat, so a naval system optimizes for depression angle, clutter rejection over the sea surface, and raw reaction speed instead of altitude coverage.

There is also the platform itself. A city grid is fixed and can be mapped in advance. A ship moves at 30 knots, pitches in heavy sea, and carries its radar, launcher, and magazine in one cramped hull that must also survive the hit if defense fails. Stack RAM behind your CIWS, keep the soft-kill decoys loaded, and never assume land radar will see the missile in time to warn you.