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This category discusses the history of radar navigation and how radar technology has improved throughout the years. Basic radar principals are explained including the different types and how the components work. Scope interpretation is introduced in this category along with radar reflection. The many variables affecting radar return are discussed, such as varying terrain and weather. Inherent scope errors are explained along with the different radar enhancements that help the navigator. The many different uses for the radar are discussed and how each can help the navigator navigate through different terrain, weather, and altitude changes.