What are the uses of gyroplanes?
Gyroplanes have quite a few applications, but the problem is that anything they can do, others (helicopters/fixed wing aircraft) can do better.


The main advantage of a rotorcraft is that they can hover at a location; the gyroplanes are unable to do this, which is kind of a deal breaker.
The main advantage of the gyroplane is that they cost less and are easier to maintain, compared to other type of aircraft. However, most of the autogyros available in market are small ones and as the size scales up, this may vanish.
The gyroplanes are used mainly for low speed surveillance operations due to their low stall speed. Of course, helicopters can be used to do this, albeit at a higher cost
So basically, the autogyro can do most of the things the helicopters/small GA aircraft can do at a lower cost. This low operational cost may be its main advantage.


I'm not aware of anything the autogyro can do which the others cannot do though.