Most of the space craft I am familiar with used an inertial guidance platform; either mechanical or ring laser gyros. Final guidance was from ground based RADAR. Imagine lobbing the satellite through apartment house window thousands of miles away at a velocity variance of less that .01 meters/second and within one second of angle. This is average performance. With an ICBM imagine lobbing a missile at the pitchers mound of a baseball park from 2500 miles away. It will land inside the bases. Much less accuracy but requires no outside guidance.