Classics state TuGui 土圭 it didn’t state LuoPan 羅盤. This is a reason why the late Li DingXin said there is no accurate LuoPan since the Qing Dynasty. His example was Early Heaven Kan can never starts from direct Zi as TuGui uses the Solar North and not the magnetic North. If you are not able to discern such you are not able to determine location 方位. Jade Ruler 玉尺 can either means landform using the mountains as ruler or implying the classic of Jade Ruler 玉尺经. Assuming if this classic is only available in the Tang Dynasty, why has it being mentioned in the Jin Dynasty?
Water as Red Pheonix and presumably contradicted that the table mountain 岸山 as Red Pheonix? Assuming that incoming water as it is prescribed as originates in ShengQi, dispatched in Nurture, moving to Prosperous, converge in Weakening, leaving in Grave are but the prescription of the 12 growth phases, it did not specifically spelt out its YinYang. This phrase 衰旺系乎形, means weak or prosperous relates to form (topography). It is the landform that determines the 12 growth phases. YinYang is only being implied. You will be surprised if a SanYuan master come and tell you Table Mountain 岸山 (which is supposing to be at the front) may also be at the rear as 岸 means shore. So, converge in Weakening 泽于将衰 does not necessary means the Bright Hall 明堂.
其来无源，其去无流 - its coming has no root, its going is seemed without leaving, Red Pheonix water reluctantly leaving the formation. In this case, a water mouth to some schools. SanHe school would say “its going is seemed without leaving” is by means of locking the water mouth with visually blocking by a mountain. SanYuan school would say, it could also means converge in Weakening 泽于将衰 by means of a pool or lake.