@kudzu

Yes, I have created routes using the Garmin Basecamp Program. Once created I then export them to my Garmin handheld GPSMap 66sr to follow the route in the field. You can also print out a graph of the route which shows distance and elevation to that if something bad happens you will know the distance and total elevation gain at which it occurred. My test course has my car at the bottom and so if extreme fatigue strikes it's all downhill to the car. Both times this occurred were at the Point Reyes National Seashore north of San Francisco so basically at sea level.