Hindu Mythology: In Hindu astronomy, the Big Dipper is known as "Saptarishi," representing seven great sages (rishis) who are venerated in various texts and traditions.
The boat often preserves Manu together with the Saptarishi (seven sages), seeds of plants, and pairs of creatures.
So the Saptarishi, seed-preservation, and Meru/Himalaya beats belong here, not in Satapatha 1.8.1.
Second, later Matsya Purana tradition expands the cast (Vishnu-Matsya, Saptarishi, seeds) and often moves the landing toward Himalaya or Meru.