ChapterAccuracy of GPS/INS Guided Munitions. Weaponeering: An Introduction, Volumecovers the basic subjects that need to be understood to compute weapon effects based on the concept of an Effectiveness Index, or EI. These subjects include weapon delivery accuracy, warhead lethality and target vulnerability ChapterDelivery Accuracy: Overview. Overview of weaponeering and weapon effectiveness ChapterOverview of Weaponeering and Weapon EffectivenessDefinitionsExample of a Weaponeering Outcome: Air