I'm a technical editor for four 500-page navigational/boating/cruising guides, and have been told by my publisher to purchase navigational software in order to help with updating the publication each year. I really, really, really do not want to buy a PC laptop. First, does anyone know of any Mac-compatable charting software? Second, would a 14" iBook or 12" PowerBook run VPC sufficiently well, or is it as bad as I hear it is? Thanks in advance.