it would be easier to test gps stuff if i could just hook up everything and select what i need. so i figure the onboard serial port plus 4 more is enough:
TSIP SVee6
NMEA SVee6
Magellan Gold
Delorme Earthmate
Motorola Oncore

The next version of gpsd will support the SVee6 in NMEA mode, by the way. Since the author of gpsd was the one who told me about the Palm 3 GPS units, I told him about the SVee6 units and he picked some up. So I figured at least this way it will "just work" when he gets it!