This means that if you were to include a code of 0x0D in the ASCII string sent to the LCD controller by the serial backpack it would display the custom character #6 stored at 0x05.
NO, CR should cause it go to the start of the line and LF should cause it to go to the NEXT line. Neither one should be displayed. This is the way ascii has worked since the days of the hard copy terminal. The special characters should be implemented with other means such as ESCape.
If you use one of the LCD controllers to monitor the output of a GPS without a CPU in the middle then you get totally unreadable data, all run together.