Did you try divePAL? PC and iPad versions are already available. Mac, iPhone and Droid versions are on the way.........I have tried all of the 'free' or trial software, and as a person who uses iPhone, iPad, pc and Mac, I am Disappointed with all of the software out there......
Not only divePAL is perfectly synchronizing all supported features - including GPS coordinates - among different platforms, but is the only dive log software that supports storing dive logs in 3D.........When I was out on the dive site the other day, I took a gps position of the site for my reference .......When I got back and sync'ed with the pc, and sync'ed with the I devices, it didn't share sites......
Alberto (aka eDiver)