A standalone GPS receiver whose principal function is radio-based navigation falls under 852691. However, if the GPS function is integrated into a broader device — such as a smartphone or a vehicle infotainment system — the article is typically classified by its principal function rather than as a navigational aid. Dedicated marine or aviation GPS units are the clearest candidates for 852691.

Both fall under 852692 regardless of end use, as the subheading covers radio remote control apparatus without restriction by application. The distinction matters for other regulatory purposes (FCC authorization, for example) but not for tariff classification within this heading. Duty rates and any applicable trade-remedy measures attach at the 10-digit tariff line level, so the specific line should be checked for each article.