APRS text messages can be selectively filtered and formatted for convenient collection of field-entered data, as described by Bob Bruninga WB4APR in his Data Reporting treatise. The View->Show Filtered Messages menu choice opens a window with three tabs:
Until the window is opened the first time, messages will not be filtered and saved; once the window has been opened, the filtering and saving will continue (based on the current settings on the filter and format tabs) until YAAC is shut down.