Im holding a copy of the flood in my hand. on pg. 288 (beginning of chapter 11)
"D+ 73:34:16 (Spartan 117 Mission Clock)
On Board the Truth and Reconciliation"
Later in that page Cortana says,"I see the coordinate data needs to be..."
This is the exact same thing Cortana says at the beginning of Keyes.
If you need more proof read chapter eleven following in The Flood

They covered the front, sides and back, but we brought death from above.