Mark 56 Gun Fire Control System
| AN/SPG-35 aboard USS Hornet | |
| Country of origin | United States | 
|---|---|
| Introduced | 1950s | 
| Type | Radar tracker | 
| Frequency | X band | 
| PRF | 3,000 pps | 
| Beamwidth | 2 | 
| Pulsewidth | 0.1-0.15 μs | 
| Range | 27 km (14.6 nmi) | 
| Precision | 9 m (10 yd) | 
| Power | 50 kW | 
Mark 56 Gun Fire Control System (Mk.56 GFCS) is a gun fire-control system made up of AN/SPG-35 radar tracker and the Mark 42 ballistic computer.