True but the idea of this thread was to demonstrate how multiple smaller corvettes and FPB's built in Bangladesh can (with addition of sophisticated sensor suites and missile armament) score victories against larger vessels.
Larger ships like frigates need sensors and radar because they are larger targets. A 500~700 ton boat is hard to target because of smaller size alone. The Pakistani Azmat class and Russian Buyan class (with VLS) are ample examples of this in a littoral scenario which will accompany the larger F-22P Zulfiquar-class, Steregushchyi and Sigma class Frigates/Corvettes. Smaller ships if properly equipped can deliver quite a bit of punch in smaller skirmishes which they are designed for.
And sensors and radar are not exclusive to larger ships anymore. The Buyan class has phased array radar to start with a full suite of sensors.
- Radar: MR-352 Pozitiv-M1.2 phased array radar system (Pozitiv-ME1.2 for export)[3]
- Fire Control: 5P-10-03 Laska (5P-10-03E for export)[3]
- Sonar: Anapa-M suite (Anapa-ME for export)[3]
- Navigational Radar: MR-231 Pal[3]
- Other: 1 x electro-optical surveillance device
Plus smaller ships around 500~700 tons can boast speed as a defensive mechanism itself. If equipped with powerful waterjets - having more than 40 knots of speed is considered a defensive feature by itself provided a couple of CIWS can protect the back from air-launched or ship-launched missiles.
In the US - they are planning follow-ons to smaller
cyclone class vessels of about 700 tons (I posted a few posts back).
Most future wars are going to be shorter skirmishes and engagements in the littoral (shallow) seas, not in blue-water high-sea scenario. The US and China get this and are getting prepared, the rest of the navies have not caught up on this yet.