"Philippe" wrote in message
...
I was trying to run
Raytech 4.1 and MapSource (Garmin) at the same time

Tricky combination, depending on what you want to achive. If you only want
both programs to receive data from the GPS, the trick of adding an extra
serial port with a serial-usb converter will work. Be aware though, that
Raytech needs the GPS to be set to NMEA while MapSource probably wants the
GPS on Garmin protocol.

If you need to send data to the GPS too, it gets more complicated.
VirtualPlex-1 takes care of that, since it works with NMEA data only and it
can buffer up sentences from more applications and queue them nicely to be
sent to the real port. But with a separate real serial port, you would have
to decide which application may send data back to the GPS and hardwire that
particular port to the RX input of the GPS.

Meindert