How do I install my seat using the LATCH system?
For installation with the Lower Anchors and Tether for CHildren (LATCH) System, begin by storing harness straps and removing lower anchors. Choose appropriate recline position, extend and attach LATCH hooks to vehicle's anchors without twisting them. Lock tension on strap once attached ensuring minimal movement when tested.
From the official Graco Nautilus 65 Manual Booster Seat manual, page 41
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