The answer to my question is yes, but only for 8 hours of recorded data.
If you are running with the Lake Master chip inserted, you will see the Lake Master overlay on top of the Unimap.
If you then turn on autochart live with the Lake Master chip inserted, you will see the autochart live recordings for up to 8 hours in addition to the Lake Master chip data. Those 8 hours will be recorded to the unit's hard drive.
Now, lets say you want to record 100 hours of sonar data and save all 100 hours--you need the zero lines card.
So basically, if you are mapping lots of small (uncharted waters), you would use your zero lines card when you go to those waters.
If you are going to a large, charted lake, you would take your LakeMaster chip and record up to 8 hours of autochart live. Suppose you could take both chips with you if you wanted to record more than 8 hours on a charted lake and save the data for later---but changing out microSD cards in 30 feet of water is something I'd rather not be doing
This is the big advantage of the larger units (Helix 9 and up I believe have two card slots)
One work around with only one card slot would be to download the recorded sonar data on the hard drive every 8 hours to a zero lines card. Then on your home PC, you upload the data to the Autochart Live Pro program. The autochart live pro program then becomes the main storage registry, which you copy to the zero lines card. The problem with one card slot will always be to whether to bring your LakeMaster chip or the zero lines card or both.