With the Gyro I use, once the ball is spinning in balance you can either put a line around the ball or a dot on the side. If you don't mind looking at a line ( I don't) you aim it in the direction that you want the ball to fly or roll. So, as you putt, you would be looking down on the line.
If you use the dot, you place the ball on the green or a tee so the dot is aimed between your feet.
By the way, in case someone is wondering, it is not against the rules of golf to put a line all the way around a ball.
Thanks,
You confirmed my understanding of the procedure.
I am a dot guy, not a striper, though.