James Porter & Son are official UK stockists for Seiko Astron. Seiko Aston are the world’s first GPS solar powered watches. Each watch absorbs light in through the dial and stores it for those times that the watch is concealed. The GPS signal sets automatically when it connects to a satellite, so no matter where you are in the world the time will always be accurate without the wearer having to manually set the watch. All models listed are online and in store.