8529.90.16.40 - Of radio navigational aid apparatus (except radar)

This HTS category, 8529.90.16.40, specifically covers printed circuit assemblies (PCAs) that are designed for use with radio navigational aid apparatus, excluding radar equipment. These PCAs are critical components that integrate electronic circuits, semiconductors, and other electronic parts onto a board to enable the functionality of navigation systems. Examples of such apparatus include GPS receivers for marine or aviation use, transponders, and other devices that assist in determining position and navigating. The core function of these PCAs is to process radio signals for the purpose of navigation, distinguishing them from components used in other types of radio equipment.

This classification is distinct from its sibling category, 8529.90.16.20, which pertains to PCAs used in radar apparatus. While both deal with radio-related electronic assemblies, the intended application is the key differentiator: this category focuses solely on navigational aids, not on the detection and tracking capabilities of radar systems. The broad category of "Other" PCAs at this level would encompass assemblies not specifically for radar or radio navigational aid equipment.

As this is a leaf node in the HTS classification, there are no further subcategories. Therefore, the classification of a specific printed circuit assembly under 8529.90.16.40 relies on a thorough assessment of its intended use within radio navigational aid equipment. This includes examining any accompanying documentation, identifying the specific radio frequencies and signals it is designed to process for navigation, and confirming that it is not primarily designed for radar functions or general radio communication.