When choosing the best handheld GPS for boating, consider features like waterproofing, battery life, and ease of use. Models like the Garmin GPSMAP 66i and the Lowrance HDS Live are top contenders, offering robust navigation capabilities and excellent durability on the water. Ultimately, the best handheld GPS for you depends on your specific needs, such as fishing, cruising, or emergency situations. Make sure to look for one with a clear display, good mapping options, and reliable satellite connectivity to ensure you stay on course, no matter where your adventures take you.