Another option if you are using a spinning reel would be to buy an extra spool(s) for the reel. Then load the spools with the line appropriate for the fish you would target on a given day.
As long as the motor and heading sensor are paired you point the motor in the direction you want to travel and lock it in. Then set the speed on constant and adjust as needed as conditions change. Direction may also need to be adjusted to stay on track.