I don't know but it looks like the xi5 may be using the same technology as the rhodan anchor. The anchor actually works as an anchor from all I've read. Holds a 2.5 foot is what they claim by using 2 gps and some military technology. The xi5 has all the same features as the saltwater Rhodan anchor including 5 foot movements and both use 2 gps receivers instead of 1 like I pilot. Anyways I'm waiting for an auto anchor that works before I spend the money on one. Hopefully the technology was bought from Rhodan to use on xi5 and spot lock actually works. I've read a few reviews that the xi5 actually holds a position very well, hoping to hear some comments on this also.