The small, compact, water-resistant handheld Bad Elf GPS Pro (Apple-approved) wirelessly allows up to five users of an iPod touch, iPhone or iPad to share real time, direct satellite GPS data for display on digital charts and a wide range of other compatible marine apps on board via satellite. Locking on to up to 15 satellites, a Bad Elf unit supplies GPS data up to 10 times a second that can be accurate to within 9 feet (2.5 meters)—allowing users to improve their GPS lock on the water beyond cell phone coverage areas.