What Garmin protocol GPS library for .NET exists

Question

Hello,

I'm developing a GIS application and i had been using devices that output NMEA protocol. There are lot's of libraries for NMEA devices, but for garmin there is only one that i have found and isnt very complete: OpenGPS.NET

I have 2 questions:

1) how do i use the library whit an USB device that does not create a virtual com?

2) Is there other preferible free garmin libraries or comercial

Btw, i have also used franson GPSgate to convert garmin to nmea, but there is a problem when the computers goes into sleep mode. when it returns i have to reset the GPS device.

Thanks very much for your time