I have just bought a new laptop computer, which I hoped to use with chart plotting software BUT it seems that the computer is too modern for available software. All plotting software seems to require the use of a serial port and my new machine, like many others, only has USB. So I bought a USB to Serial converter thinking, and being assured that, it would do the trick. No such luck! The laptop has a built in modem, which resides on COM 3 and the infrared device lives on COM 4,so my USB converter has taken up residence on what seems to be a fictitious port COM 5. Non of my serial devices will link to this port and no one seems to be able to suggest that the USB can be moved to the free COM 1. Motto, beware if you are thinking of buying a laptop for you boat!