Should I use the top tether strap when installing the seat forward-facing?
Yes, you must attach and tighten the top tether strap when installing the seat forward-facing. When used properly, the top tether helps reduce injury in a sudden stop or crash. You should consult your vehicle's owner manual for the specific top tether anchor location. (Page 32, Page 37)
From the official Graco Graco Nautilus 65 Manual Booster Seat User manual, page 32
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