There seems to be a few available on Amazon now, but it's still a bit too expensive
That means your phone is rooted or Knox has been triggered. Samsung Health doesn't work when phones are rooted or Knox is 1.
https://play.google.com/store/apps/details?id=trunghieu.tnt.samsungdevicetest
Check Device information in that app to know if your phone is rooted or Knox is 1.
One last question. In the second question I made, the google maps one. Yes I know it doesn't have gps, but I saw some gear fit app that allows you to see where to go in your watch https://play.google.com/store/apps/details?id=smartwatchstudios.app.com.gearfitnavigation That one