What does second pilot on fighter jet do?

Interceptor planes and reconnaissance fighter planes have 2 pilots...the 2nd pilot is the navigator..he is in charge of the intercept radar (hes in charge of tracking the target and making the fastest flight path to it), taking pictures for reconnaissance or even "painting" targets for air strikes and sending them to a bomber and such...planes like the F 16 or F 22 are design to be scrambled ASAP and only to fight, have 1 pilot...