Pix4Dmapper updated the coordinate system database, and some coordinates systems are getting labeled as (deprecated). This is due to the fact that the coordinate system authorities labeled them as deprecated in the newer version of the database.
The deprecated label is for informational purposes and does not alter the coordinate system parameters used for processing.
For example, the coordinate system is shown as:
NAD_1983_StatePlane_Virginia_South_FIPS_4502_Feet, in Pix4Dmapper 4.5 and older.
NAD_1983_StatePlane_Virginia_South_FIPS_4502_Feet (deprecated)in Pix4Dmapper 4.6 and newer.
In practice, the label deprecated does not mean that any of the parameters changed or that using this coordinate system will in any way affect the processing. The deprecated label is mostly for informational purposes.
If the coordinate system got labeled as deprecated you can continue using it, but we recommend checking with the national mapping authorities if there is an updated version you should use.
Let us know if you have any questions,