https://en.wikipedia.org/wiki/Lun-class_ekranoplan
Only one built, and it's still on the shore of the Caspian sea:
- OpenStreetMap: https://www.osm.org/?mlat=41.94067&mlon=48.37885&zoom=18&layers=M
- Gmaps satellite: https://www.google.com/maps?ll=41.94067,48.37885&q=41.94067,48.37885&hl=en&t=h&z=18
General characteristics
- Crew: 15 (6 officers, 9 enlisted)
- Capacity: 137 t (302,000 lb)
- Length: 73.8 m (242 ft 2 in)
- Wingspan: 44 m (144 ft 4 in)
- Height: 19.2 m (63 ft 0 in)
- Wing area: 550 m2 (5,900 sq ft)
- Empty weight: 286,000 kg (630,522 lb)
- Max takeoff weight: 380,000 kg (837,757 lb)
- Powerplant: 8 × Kuznetsov NK-87 turbofans, 127.4 kN (28,600 lbf) thrust each
Performance
- Maximum speed: 550 km/h (340 mph, 300 kn)
- Cruise speed: 450 km/h (280 mph, 240 kn) at 2.5 m (8 ft)
- Range: 2,000 km (1,200 mi, 1,100 nmi)
- Service ceiling: 5 m (16 ft) in ground effect
Armament
- Guns: two 23mm Pl-23 cannon in a twin tail turret and two 23mm Pl-23 cannon in a twin turret under forward missile tubes
- Missiles: six launchers for P-270 Moskit Sunburn antiship missiles
If you attack it head on you have a very short window of opportunity before it's past you and if you try from the side you'll have to be really really good at geometry. And that thing won't go in a straight line while it's in enemy range.
So, you have to be accurate. Like we've been doing for hundreds of years with projectiles, even non-guided ones. Check.
So... good like as in a computer doing the math? Check.
Bad news friend, they can't turn for shit due to ground effect, and they can't ascend or descend either. There's a reason these things were immediately abandoned as a viable concept after only 3 years in operation and without seeing any combat.