https://blog.wongcw.com/2022/09/13/watchos-9%e6%8c%87%e5%8d%97%e9%87%9d%e6%87%89%e7%94%a8%e6%9b%b4%e6%96%b0%e6%94%af%e6%8c%81waypoints%e8%88%87backtrack%e5%8a%9f%e8%83%bd/