[epiclesis]

I have the Boulevard, but did a little research.

It appears that the Marathon also has the versa tether too. On the back of your car seat at the top there should be a small pouch with straps in it. That's the versa tether. In addition to that, there should be another strap that has a metal ring on it, as well as a loop in the strap. You take that strap and wrap it around someplace, such as the rail of the passenger seat that the seat slides on. Put the metal part through the loop and attach the versa tether to that.

Hope that helps!

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