If it's the same yacht as the AIS track I saw, and I'm fairly confident it is, the transponder didnt give a reading after just before it was off shore from Marlo or there abouts. The track was first heading east offshore, then turned sharply towards the coast and continued in a wide curve gradualy changing its heading eastward. Here is a rough drawing of the more irregular AIS track.
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In fact, the track was so irregular that I was concerned and I tried to find the yacht on Marine traffic several times later in the day and on Sunday. I thought and hoped that maybe it was on a day trip or ocean trial and had headed back to Lakes Enterance.