Garmins newest Golf GPS – The Approach S1. Designed to look like a normal sports watch but offering so much more. The S1 provides accurate distances and measures individual shot distances. Has a lithium ion rechargable battery that lasts for up to 3 weeks in watch mode and up to 8 hours in GPS mode. Just like the other Garmin Approach units, the S1 conforms to USGA / R&A rules and is the perfect choice for any golfer.