From this site, you can download software to your Garmin watch.
Then you can upload your course lat/lon info from OCAD, TXT format etc. explanation on website. Your course will be uploaded to website.
Then you can choose any course and coordinates will be downloaded to your watch.
When you start to course and press start button, you will see the distance to CP and CP number like Ctrl 1-2-3 etc.
Sensitivity is 20 meters diameter for now. When you are in circle the watch buzzes and beeps as you reached to CP.
I checked in city but not yet in forest. It would be useful for training with an old map without flags on course.