justfred
Adventurer
No built in GPS (I think) so you would need to add one (I am not sure how, bluetooth?). No SD/CF card slot for adding maps or downloading photographs. No USB connectivity for external device (Printer, OBDII, card reader etc). Doesn't run a full fledged or open operating system, so existing mapping apps won't work on it. While I definitely like the concept of a table computer, the iPad is no the one I am going to buy.
Probably does have GPS. Peripherals attach by dock connector or bluetooth or wifi. There are existing mapping aps for iPhone which will no doubt be among the first to be upscaled.
My problem is it isn't waterproof, yet, and there isn't a camera-thread mount on the back, but I'm sure that will change.