G1 is a smart GPS watch that offers features such as green undulation, course layout, color touch screen, customizable pin placement and slope. G1 gives yardages to the front, center and back of the green and allows you to manually select pin position, get yardages to hazards and bunkers. The lightweight and thin G1 watch is our most advanced watch. Green Undulation Data available on select courses only. While standard GPS data is available on most courses across the world, Green Undulation data in the USA is available on a select basis and continuously being expanded. International Customers: Green Undulation data is currently available in the USA and South Korea only. Green Undulation data availability outside these countries has not yet been determined.