If you plan to run workspaces that transform data between the datums NAD27 and NAD83 without explicitly choosing a transformation in a CsmapReprojector transformer, you must decide whether to use datum shift files for Canada or the US. Run one of the following from a command prompt to tell FME which Grid Shift file to use:
If SYSTEM is specified, the setting applies to all FME processes run on the machine. If not specified, the setting applies only to FME processes run by the current user.