[ErnstStavroBlofeld]

The missile is guided by a GPS and its fired from a land based launcher.It combines a manuverable warhead with a terminal guidance system.

[Vanders9]

A terminal guidance system being some kind of active radar homing - which can be detected, decoyed and jammed.

It doesn't matter how big and impressive the missile looks. It won't do any damage if it can't hit.