I was wondering the same thing. I have heard navionics will soon be offering software for your computer that will do just that,and more. It will work on all the navionics chips. Supposed to be out in a month or so. Check their website in the news section.

Scooter, my boat dealer said he had a way to tie his two lms332c together so that they would work on one chip and share info. I don’t know if he was pulling my leg or not but he was going to try it on his boat first and let me know. If it is feasible I will post it.