Electronic charting without a serial port...
I feel your pain.
I have contacted several nav. software suppliers about why they did not see the change coming to laptops that would have only CD drives and only USB or Firewire ports that started with many computers over 4 years ago. Evidently they have all been ignoring these changes (I will not go so far as to say "improvements") in technology that have happened.
Heck, I have not had a serial or parralel port or even a floppy drive in any home computer for over two years now. Still shopping for a laptop and some nav. software...
Same people probably still use flax sails and hemp halyards!