The guidance and control package that a country needs to support an ICBM depends upon the desired accuracy it expects to achieve with its missile. Without a PBV, this accuracy is going to be poor, and more rudimentary technology can be used. Any industrial/advanced nation manufactures equipment and parts that, when properly constructed, can be used to build an inertial measuring unit. In addition to the United States, a proliferant can turn to Belgium, Germany, France, Holland, Sweden, Norway, Finland, Austria, the Czech Republic, Hungary, Russia, Italy, China, North Korea, South Korea, Taiwan, Australia, New Zealand, Egypt, or India. In general, though, a guidance and control unit, using a digital guidance computer and consistent with a staged missile, cannot be built from cannibalized parts of older, analog guidance systems. A PBV requires a small liquid rocket motor, cold gas thrusters, or many small total impulse solid rocket motors. These motors must be supported by a small guidance, control, and navigation unit that flies with the RVs until they are dropped. GPS units have wide application for this particular phase of the ICBM trajectory. Because of existing export controls, a proliferant would have to modify an over-the-counter GPS receiver to operate at high altitude and at ICBM velocities. The knowledge of how to build a GPS receiver is now widespread, however, and many individual hobbyists have built receivers that evade these restrictions. A modified GPS receiver or a GLONASS receiver is completely consistent with the needs of a PBV.
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