Hi,
I’m surprised I was the first one to notice this but I saw a new Humminbird PC update released on the HB website when I was checking (hoping) for new updates for my HB units. I also got a new version of Google Earth to try with this new release. Note: the latest Google Earth 5.2 will not load for some reason (missing a DLL???) so I found a Beta release 5.2.1 on FileHippo.com. Everything seems to work in my initial testing.
Have fun and chime in with any additional info. 
Take care,
Roger