Garmin vs PC
Andre,I assume you are using the Garmin cable to connect to your serial port?What software are you using to connect to the GPS?Garmin's can communicate with PC's in two modes. The Garmin protocol and NMEA. Software such as MapSource is used to transfer maps, waypoint, route and track information between the PC and uses the Garmin/Garmin interface.Running the MapSource software is why you need a Virtual PC on a Mac to make it work. Its the mapping software that is Windows based, not the communication protocol.Most Navigation software that uses GPS input to show your position on the screen require NMEA output from the GPS.Before your Garmin GPS will "talk" to a Windows, DOS, or Mac PC the interface must be set correctly at the GPS unit.From the Settings screen on the GPS there should be an interface selection. Set the interface to either Garmin/Garmin or NMEA/NMEA depending on what your software requires.As far as "With a Mac you have a 'leading edge' computer. Its just that GPS manufacturers haven't updated their equipment to 'fire wire', or other 'modern' etc. connectivity." ...PC's are tools. I chose tools based on the job at hand. Rather that try to get a metric wrench to fit a SAE fastener, I get a SAE wrench. If the software I need to run was designed for an operating system, I get a platform that runs that OS.I'm sure that most people that chose Macs also choose Betamax for it's better quality, they are used to limited selection at the video store.

For the price of PC these days, it makes no sense to me not to have a machine that runs the software you want. For onboard use that means a Windows platform, or a robust Windows emulator for other platforms. If you decide to have Nav software onboard that control the auto pilot, you need 100% Windows compatibility for many programs. I'm sure there are native Mac navigation systems out there, but choices are limited.I don't like Windows, never have. I'd be running OS/2 if software was available. For the things I use PC's for I chose a wrench that fits the most fasteners ... Windows (gag).