Replacement Chart:
This is an advanced functionality.
If you select the option "Degrees read on the compass", you must enter, as orientation information, the exact direction you have read on your compass, for instance 22.4 degrees.
This may be a "critical zone" between 2 of the 24 "directions".
For instance 22,4 belongs to North - Gui, but is not far from NE - Chou
Sometimes, not always, the theory says "it's not the right chart, a replacement chart is needed".If you select the Replacement Chart: Yes option, LuQi will check if this location is in a critical zone and compute automatically this replacement chart, wich will contain a Red R.
Try it with Period 7.
But you will also notice that no replacement chart is needed in Period 9 in this example.