Currently I have a Windows 7 laptop, but I am considering purchasing a new dedicated laptop for the boat. Nothing special, just something that isn't aged. I used the one I have now while I was driving truck and it's seen it's share of abuse and I don't want to see the hard drive crash.
As for the Radar, It was very reasonably priced and I am getting a display with it, so it really isn't a complete wasted purchase.
I also have an iPad and the iNavx app and I know it can be networked with some devices.
I also downloaded the Navionics iPad and iPhone app ( https://itunes.apple.com/us/developer