Finally, the converter computes CRC-16 (polynomial 0x8005, initial 0x0000) over all bytes from byte 4 to the end of file and appends it to the footer. Without this, OziExplorer displays "Invalid MCR structure."
The underlying algorithms (typically Thin-Plate Spline transformations) are robust. The code is generally open-source and peer-reviewed. If you are using a standard R script to do this conversion, the math is sound, but the data cleaning steps (checking for NAs) are often left to the user. gme to mcr converter work