With the track record feature you can play back from the begining or the end of the track. What I have found is that if you have a separate gps unit on the boat when you record a track mark the start of the track as a waypoint on your gps and store it as " start track A" and when you get to the end where you want to stop recording store it as "end track A" on your gps. Your motor is probably going to have a hard time playing back the track if you are going down stream with the bow going with the current unless your going at a pretty good clip I found this out fishing with a strong south wind, the motor always wants to keep the bow on track so if the wind is pushing your stern around the bow will stay on track but essentially the boat will be traveling down the lake sideways. Into the wind the thing is flawless! Especially if you are using the anchor feature. I tried it out when I wanted to clean some stuff up on the boat and put away some gear, had a steady 15 mile an hour south wind pointed the bow into the wind and hit the anchor feature and that boat didn't move for 20 minutes while I was cleaning things up. These motors are very impressive extremely happy with my purchase.
Tom