Everything on the iPad data is accessed and manipulated via iTunes on your desktop
computer. You will need to get the maps from your Windows computer using iTunes... Make sure that the windows computer is the one you have paired your iPad to. They only marry the device to one computer at a time, or you need to go through a long process to pair the iPad to a new computer and new iTunes library.
I have been looking into the possibility of the new iPad as well for the use of maps and additional Plotting.
Thank you everyone for the great input !!! I will try the SEAiq as well !!!