It's all proprietary. Depends on the charts. Depends on the
software. Depends on the plotter.
If you want to transfer to a plotter, the answer will usually be: Probably not. But if it's one of the rare instances you can, you'll probably have to pay for it.
Pretty much, if you want to use existing and/or free charts, you need a PC setup to use for
navigation. No plotter I am aware of will use the free
ENC charts. And I am also not aware of any plotter that uses raster charts (which includes all BSBs). The plotters all use proprietary charts. And for proprietary charts you need proprietary card readers, cards and
software.
But, there may be an exception out there I am not aware of..
So, the
trade off is: Convenience, durability, etc. of a chart plotter and be stuck with
buying proprietary charts. Or the complications of a PC (and expense of the display, which may rival or exceed the
price of a plotter), but the possibility of free software and a lot of free charts. And the ability to but charts of different formats.
My choice? Have both. The PC is main, the chartplotter is the backup.
-dan
PS The tradeoff section is just touching the issues. There are a lot of tradeoffs and options. I'm sure now that I have answered, others will jump at the chance to tell me where I went wrong.