Connecting a GNS 430/530 to a PC

Hi,

It seems most handheld GPS can be connected to a computer (through a serial
cable, IIRC).
That allows some cool features, like preparing your flightplan in advance on
your PC, or downloading to the PC the actual positions of your aircraft in
order to obtain a chart of the actual flight path.
Now, do you know if panel-mounted GPS can also be connected to a PC ? Namely
for Garmin's GNS 530 ?
I can't see any reference to this on the 530 reference manual, and I would
be surprise that handheld GPS can do thing that Garmin's top tier GPS can't.

fu2 rec.aviation.marketplace
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YAG