Handheld GPS units are portable devices that use the Global Positioning System to determine your exact location on Earth. They are commonly used for outdoor activities like hiking, camping, and geocaching, providing users with real-time navigation and mapping capabilities. These devices can display coordinates, track routes, and help users find their way in unfamiliar areas. Most handheld GPS units are equipped with features such as waterproofing, long battery life, and preloaded maps. Some models also offer additional functionalities like Bluetooth connectivity, compass features, and altimeter readings, making them versatile tools for adventurers and outdoor enthusiasts.