Ice Mode data in NMEA output ?

I set up a awac Prolog to profile (20 cells) and do wave measurements and selected Ice Mode on the 'General Tab' in the software.  I Also set this system to output NMEA data.  I am able to collect all the data but I can NOT find where the "ICE thickness" (output from selecting 'ice Mode' in General Tab) is being put in all of the NMEA output strings.   I read the AWAC and Integration pdfs and cannot find any information on this.    Do I need to do something to the instrument to be able to get "ICE" data out in the NMEA output strings?  Is getting 'ice' data in NMEA output strings even possible?

Any help would be greatly appreciated.