Thanks! I like Rustle's idea best cos that means we can all update the card, depending on who's about, rather than needing to move internal kit between computers.
I've e-mailed Jepp to ask if they're joining the 21st century with a proper card writer. I wonder if a PCWorld one would do the job... Might find out soon.
But I see when you take out your first subscription, you are required to buy their PCMCIA device. Captive business!