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.
I found another reason that the line is helpful. I don't use the line after reading some of David Orr's posts on how the line doesn't help golfers that much and it is tough sometimes to get it aligned the way you want to. However, I just got a putter fitting Monday and we reduced my skid by about 20%. Now I have a new putter and it's reduced by greater than 25%. Before with the old putter if I putted on the line the ball would inconsistently roll end over end. Now with an improvement on the putter, my ball rolls very consistently end over end. I have been trying it out on the practice green. So if you have questions about your skid, using the line may give you a decent answer.