I went out on a 50 mile ride today that was pretty close to an "out and back." I got to 25 miles and headed back. At about 35 miles, I got lost. So I thought, no worries, I have my Garmin. Let me have it tell me how to get back home. I selected Navigation and it asked me to choose 1) the most direct route to the start OR 2) to choose the route I came on (something like that). So I knew the direct route to the start would not be good because I knew the direct route was in high traffic areas. I needed the route I originally went on so I chose the other option. Here was the problem. The dumb computer literally thought I wanted to retrace my steps from that point. So rather take me back on my route that I had only had 15 miles to complete, it took me the exact opposite way attempting to have me backtrack through what I had already completed and then come back through right where I was already sitting. Fortunately, I figured out it was doing this after only a few miles and just turned navigation off.
So what do you do in a situation like this? Is there a way to force the computer to tell it I don't want to retrace all my steps and that I want it to pick up at a different point? Seems like there should be a way to do this.