A note on targetting, one other option to mid-course/near-terminal guidance for a long-range missile is a high-low flight pattern where the missile can use it's own radar at a high altitude for the mid-course correction, then dip down to sea-skimming for the terminal run. The downside to that method is that while it's flying high and emitting, the target gets much more warning that it is coming and can take more effective measures to defeat the missile, possibly even beginning counter-fire while the incoming missile still at high altitude.
Mike
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