you have 8 buttons on the MG XI5 remote which you can save as both waypoints and/or tracks. Problem with the tracks is that you have to record them first before being able to track or follow them. But with the waypoints even if its not connected to your sounder you can record 8 different marks and come back in 3 months ( or 3 years) for example and if your within 6km of that point, you press the certain number and the motor guide will drive you back to that position and literally anchor you there.
I have the MG 80lb 24v and my GPS is far more accurate than showed in that video.
As for the Minn Kotas the auto deploy (ulterra models) are not available in 55lb thrusts on the 80lb and 112lb thrusts. Also the Motor guide are about $400 - $600 cheaper which will buy you a good quality AGM battery!